lint

- Move TransactionLedger + types from @excalidraw/element into
  packages/excalidraw/transaction.ts (no external consumers)
- Move commitSyntheticIncrement from App passthrough to Store directly,
  fix didAppStateChange to use Delta.isRightDifferent instead of
  presence-check, and replace isolated increments queue with direct
  scheduleMicroAction + flushMicroActions
- Remove commitSyntheticHistoryEntry from App, expose store and
  createTransaction on AppClassProperties instead
- Replace O(N) deep-copy snapshot in updateScene with shallow map copy
  (element refs are safe — ledger ignores index, the only in-place
  mutated prop, and deep-copies only recorded elements)
- Merge ledger + manager tests into single transaction.test.tsx
- Update dev-docs to reflect new file structure

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/cancel.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 3
     steps:
-      - uses: styfle/cancel-workflow-action@0.6.0
+      - uses: styfle/cancel-workflow-action@ce177499ccf9fd2aded3b0426c97e5434c2e8a73 # 0.6.0
         with:
           workflow_id: 400555, 400556, 905313, 1451724, 1710116, 3185001, 3438604
           access_token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/locales-coverage.yml

@@ -40,7 +40,7 @@ jobs:
           echo ::set-output name=body::$body
 
       - name: Update description with coverage
-        uses: kt3k/update-pr-description@v1.0.1
+        uses: kt3k/update-pr-description@1b35a6dcd84d81aa0bc1889610efdcde7f37b0c0 # v1.0.1
         with:
           pr_body: ${{ steps.getCommentBody.outputs.body }}
           pr_title: "chore: Update translations from Crowdin"

.github/workflows/publish-docker.yml

@@ -13,16 +13,16 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v3
       - name: Login to DockerHub
-        uses: docker/login-action@v2
+        uses: docker/login-action@465a07811f14bebb1938fbed4728c6a1ff8901fc # v2
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@c7c53464625b32c7a7e944ae62b3e17d2b600130 # v3
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3
       - name: Build and push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25 # v5
         with:
           context: .
           push: true

.github/workflows/semantic-pr-title.yml

@@ -11,6 +11,6 @@ jobs:
   semantic:
     runs-on: ubuntu-latest
     steps:
-      - uses: amannn/action-semantic-pull-request@v5
+      - uses: amannn/action-semantic-pull-request@e32d7e603df1aa1ba07e981f2a23455dee596825 # v5
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/size-limit.yml

@@ -20,7 +20,7 @@ jobs:
         working-directory: packages/excalidraw
         env:
           CI: true
-      - uses: andresz1/size-limit-action@v1
+      - uses: andresz1/size-limit-action@e7493a72a44b113341c0cf6186ab49c17c4b65c1 # v1
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           build_script: build:esm

.github/workflows/test-coverage-pr.yml

@@ -21,6 +21,6 @@ jobs:
         run: yarn test:coverage
       - name: "Report Coverage"
         if: always() # Also generate the report if tests are failing
-        uses: davelosert/vitest-coverage-report-action@v2
+        uses: davelosert/vitest-coverage-report-action@2500dafcee7dd64f85ab689c0b83798a8359770e # v2
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}

README.md

@@ -29,7 +29,7 @@
   <a href="https://docs.excalidraw.com/docs/introduction/contributing">
     <img alt="PRs welcome!" src="https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat"  /></a>
   <a href="https://discord.gg/UexuTaE">
-    <img alt="Chat on Discord" src="https://img.shields.io/discord/723672430744174682?color=738ad6&label=Chat%20on%20Discord&logo=discord&logoColor=ffffff&widge=false"/></a>
+    <img alt="Chat on Discord" src="https://img.shields.io/discord/723672430744174682?color=738ad6&label=Chat%20on%20Discord&logo=discord&logoColor=ffffff&widget=false"/></a>
   <a href="https://deepwiki.com/excalidraw/excalidraw">
     <img alt="Ask DeepWiki" src="https://deepwiki.com/badge.svg" /></a>
   <a href="https://twitter.com/excalidraw">

dev-docs/docs/codebase/transactions.mdx

@@ -0,0 +1,125 @@
+# Transactions
+
+Transactions let many live scene updates render immediately while still committing a single durable history entry.
+
+Typical use case:
+
+- AI streaming emits many `NEVER` updates for real-time feedback.
+- Those updates advance the live scene and store snapshot, but do not create undo history.
+- A transaction records the intended logical delta separately, then commits one synthetic durable increment at the end.
+
+## Key Files
+
+### `packages/excalidraw/transaction/`
+
+- `transaction.ts`
+  - `Transaction` is the per-tx instance.
+  - `updateScene()` applies live updates with `captureUpdate: NEVER`.
+  - `updateElements()` is a typed partial-patch helper over `updateScene()`.
+  - `commit()` builds synthetic snapshots and commits one durable entry.
+  - `cancel()` ends the tx without committing history.
+- `ledger.ts`
+  - `TransactionLedger` keeps per-element baseline, target, and touched props across tx steps.
+  - `buildSyntheticSnapshots()` reconciles tx intent with the live scene using `live-wins-per-prop`.
+- `undoOverridePlanner.ts`
+  - Tracks tx intermediate values.
+  - Produces undo override candidates for regular user history entries that were recorded while a tx was active.
+- `manager.ts`
+  - Owns tx lifecycle state and active-tx priority.
+  - Injects tx undo markers into durable deltas at record time.
+  - Resolves effective history deltas at undo/redo time.
+- `diff.ts` / `types.ts`
+  - Shared diff helpers and transaction-specific types.
+
+### `packages/element/src/store.ts`
+
+- `store.commitSyntheticIncrement()`
+  - Builds `StoreSnapshot -> StoreChange -> StoreDelta` from logical before/after snapshots.
+  - Commits the synthetic durable increment immediately through an isolated path.
+  - Does not flush unrelated pending micro actions.
+- `StoreDelta.markers`
+  - Carries extra history markers such as `txUndoOverrides`.
+
+### `packages/excalidraw/history.ts`
+
+- `onBeforeRecord()`
+  - Lets the transaction manager attach markers before a durable delta becomes a history entry.
+- `setEffectiveDeltaResolver()`
+  - Lets the transaction manager rewrite a history delta at undo/redo time before it is applied.
+
+## Flow
+
+1. Caller creates a transaction.
+2. `tx.updateScene()` applies live updates with `NEVER`.
+3. The ledger records net element changes; appState intent is accumulated separately.
+4. Regular user durable edits that happen while the tx is active may receive tx undo markers.
+5. `tx.commit()` asks the ledger for logical before/after snapshots and calls `store.commitSyntheticIncrement()`.
+6. Undo/redo later uses the manager's effective-delta resolver to decide whether ended tx markers should patch the baseline of a regular history entry.
+
+Result:
+
+- live rendering stays immediate;
+- one tx still produces one durable history entry;
+- interleaved regular edits can undo back to the correct pre-tx baseline.
+
+## Undo Examples
+
+### Interleaved Regular Edit
+
+1. Baseline: `rect = (x: 0, stroke: black)`
+2. Tx updates it live to `(x: 200, stroke: red)` with `NEVER`
+3. User makes a regular durable edit: `(x: 200, stroke: purple)`
+4. Tx commits; live stays purple
+
+The user history entry was recorded while the tx was active, so its local baseline is `red`.
+If undo later runs after the tx has ended, restoring `red` is wrong: the correct pre-tx baseline is `black`.
+
+To fix this:
+
+- record-time attaches a tx undo marker to the user history entry
+- perform-time checks whether the tx has already ended
+- if ended, the effective delta is patched so undo restores `black` instead of `red`
+
+### Active Tx vs Ended Tx
+
+Using the same example:
+
+- if the user undoes while the tx is still active, the marker stays inactive and undo restores the tx intermediate value (`red`)
+- if the user undoes after the tx has ended, the marker becomes active and undo restores the pre-tx baseline (`black`)
+
+So markers are recorded early, but applied conditionally.
+
+## AppState
+
+Elements use ledger snapshots. AppState does not.
+
+The transaction instead keeps:
+
+- `initialAppState`: observed appState at tx start
+- `accumulatedAppState`: merged caller intent from `tx.updateScene({ appState })`
+
+At commit, the transaction computes the final appState patch and passes it into `store.commitSyntheticIncrement()`.
+
+## Example
+
+```ts
+const tx = app.transactionManager.create();
+
+tx.updateScene({ elements: updatedElementsA });
+tx.updateScene({ elements: updatedElementsB });
+tx.updateElements({
+  elements: [
+    { id: "rect-1", type: "rectangle", updates: { strokeColor: "#f00" } },
+    { id: "rect-2", type: "rectangle", updates: { x: 120 } },
+  ],
+});
+
+tx.commit();
+```
+
+## Notes
+
+- `commit()` and `cancel()` are idempotent.
+- `updateScene()` and `updateElements()` throw after the tx has ended.
+- Conflict handling inside synthetic snapshots is fixed to `live-wins-per-prop`.
+- Multi-tx interleaving is supported through manager-owned lifecycle tracking and active-tx priority.

dev-docs/docusaurus.config.js

@@ -97,8 +97,8 @@ const config = {
                 href: "https://discord.gg/UexuTaE",
               },
               {
-                label: "Twitter",
+                label: "𝕏",
-                href: "https://twitter.com/excalidraw",
+                href: "https://x.com/excalidraw",
               },
               {
                 label: "Linkedin",

packages/element/src/bounds.ts

@@ -680,8 +680,9 @@ export const getMinMaxXYFromCurvePathOps = (
   return [minX, minY, maxX, maxY];
 };
 
-export const getBoundsFromPoints = (
+export const getBoundsFromPoints = <P extends GlobalPoint | LocalPoint>(
-  points: ExcalidrawFreeDrawElement["points"],
+  points: readonly P[],
+  padding: number = 0,
 ): Bounds => {
   let minX = Infinity;
   let minY = Infinity;
@@ -695,7 +696,7 @@ export const getBoundsFromPoints = (
     maxY = Math.max(maxY, y);
   }
 
-  return [minX, minY, maxX, maxY];
+  return [minX - padding, minY - padding, maxX + padding, maxY + padding];
 };
 
 const getFreeDrawElementAbsoluteCoords = (
@@ -1261,6 +1262,17 @@ export const pointInsideBounds = <P extends GlobalPoint | LocalPoint>(
 ): boolean =>
   p[0] > bounds[0] && p[0] < bounds[2] && p[1] > bounds[1] && p[1] < bounds[3];
 
+// TODO make pointInsideBounds inclusive and remove this function once we
+// test nothing is breaking
+export const pointInsideBoundsInclusive = <P extends GlobalPoint | LocalPoint>(
+  p: P,
+  bounds: Bounds,
+): boolean =>
+  p[0] >= bounds[0] &&
+  p[0] <= bounds[2] &&
+  p[1] >= bounds[1] &&
+  p[1] <= bounds[3];
+
 export const doBoundsIntersect = (
   bounds1: Bounds | null,
   bounds2: Bounds | null,
@@ -1275,13 +1287,21 @@ export const doBoundsIntersect = (
   return minX1 < maxX2 && maxX1 > minX2 && minY1 < maxY2 && maxY1 > minY2;
 };
 
+export const boundsContainBounds = (outerBounds: Bounds, innerBounds: Bounds) =>
+  [
+    pointFrom<GlobalPoint>(innerBounds[0], innerBounds[1]),
+    pointFrom<GlobalPoint>(innerBounds[0], innerBounds[3]),
+    pointFrom<GlobalPoint>(innerBounds[2], innerBounds[1]),
+    pointFrom<GlobalPoint>(innerBounds[2], innerBounds[3]),
+  ].every((point) => pointInsideBoundsInclusive(point, outerBounds));
+
 export const elementCenterPoint = (
   element: ExcalidrawElement,
   elementsMap: ElementsMap,
   xOffset: number = 0,
   yOffset: number = 0,
 ) => {
-  if (isLinearElement(element)) {
+  if (isLinearElement(element) || isFreeDrawElement(element)) {
     const [x1, y1, x2, y2] = getElementAbsoluteCoords(element, elementsMap);
     const [x, y] = pointFrom<GlobalPoint>((x1 + x2) / 2, (y1 + y2) / 2);
 

packages/element/src/collision.ts

@@ -154,14 +154,11 @@ export const hitElementItself = ({
 
   // Hit test against the extended, rotated bounding box of the element first
   const bounds = getElementBounds(element, elementsMap, true);
-  const hitBounds = isPointWithinBounds(
+  const hitBounds = isPointInRotatedBounds(
-    pointFrom(bounds[0] - threshold, bounds[1] - threshold),
+    point,
-    pointRotateRads(
+    bounds,
-      point,
+    element.angle,
-      getCenterForBounds(bounds),
+    threshold,
-      -element.angle as Radians,
-    ),
-    pointFrom(bounds[2] + threshold, bounds[3] + threshold),
   );
 
   // PERF: Bail out early if the point is not even in the
@@ -192,18 +189,32 @@ export const hitElementItself = ({
   return result;
 };
 
+const isPointInRotatedBounds = (
+  point: GlobalPoint,
+  bounds: Bounds,
+  angle: Radians,
+  tolerance = 0,
+) => {
+  const adjustedPoint =
+    angle === 0
+      ? point
+      : pointRotateRads(point, getCenterForBounds(bounds), -angle as Radians);
+
+  return isPointWithinBounds(
+    pointFrom(bounds[0] - tolerance, bounds[1] - tolerance),
+    adjustedPoint,
+    pointFrom(bounds[2] + tolerance, bounds[3] + tolerance),
+  );
+};
+
 export const hitElementBoundingBox = (
   point: GlobalPoint,
   element: ExcalidrawElement,
   elementsMap: ElementsMap,
   tolerance = 0,
 ) => {
-  let [x1, y1, x2, y2] = getElementBounds(element, elementsMap);
+  const bounds = getElementBounds(element, elementsMap, true);
-  x1 -= tolerance;
+  return isPointInRotatedBounds(point, bounds, element.angle, tolerance);
-  y1 -= tolerance;
-  x2 += tolerance;
-  y2 += tolerance;
-  return isPointWithinBounds(pointFrom(x1, y1), point, pointFrom(x2, y2));
 };
 
 export const hitElementBoundingBoxOnly = (
@@ -573,7 +584,9 @@ const intersectLinearOrFreeDrawWithLineSegment = (
       continue;
     }
 
-    const hits = curveIntersectLineSegment(c, segment);
+    const hits = curveIntersectLineSegment(c, segment, {
+      iterLimit: 10,
+    });
 
     if (hits.length > 0) {
       intersections.push(...hits);

packages/element/src/frame.ts

@@ -1,7 +1,6 @@
 import { arrayToMap } from "@excalidraw/common";
 import { isPointWithinBounds, pointFrom } from "@excalidraw/math";
 import { doLineSegmentsIntersect } from "@excalidraw/utils/bbox";
-import { elementsOverlappingBBox } from "@excalidraw/utils/withinBounds";
 
 import type {
   AppClassProperties,
@@ -18,6 +17,8 @@ import {
   getElementLineSegments,
   getCommonBounds,
   getElementAbsoluteCoords,
+  doBoundsIntersect,
+  getElementBounds,
 } from "./bounds";
 import { mutateElement } from "./mutateElement";
 import { getBoundTextElement, getContainerElement } from "./textElement";
@@ -920,16 +921,17 @@ export const getFrameLikeTitle = (element: ExcalidrawFrameLikeElement) => {
 export const getElementsOverlappingFrame = (
   elements: readonly ExcalidrawElement[],
   frame: ExcalidrawFrameLikeElement,
+  elementsMap: ElementsMap,
 ) => {
-  return (
+  return elements.filter(
-    elementsOverlappingBBox({
+    (el) =>
-      elements,
+      // exclude elements which are overlapping, but are in a different frame,
-      bounds: frame,
-      type: "overlap",
-    })
-      // removes elements who are overlapping, but are in a different frame,
       // and thus invisible in target frame
-      .filter((el) => !el.frameId || el.frameId === frame.id)
+      (!el.frameId || el.frameId === frame.id) &&
+      doBoundsIntersect(
+        getElementBounds(el, elementsMap),
+        getElementBounds(frame, elementsMap),
+      ),
   );
 };
 

packages/element/src/selection.ts

@@ -1,15 +1,32 @@
-import { arrayToMap, isShallowEqual } from "@excalidraw/common";
+import { arrayToMap, isShallowEqual, type Bounds } from "@excalidraw/common";
+import {
+  lineSegment,
+  pointFrom,
+  pointRotateRads,
+  type GlobalPoint,
+} from "@excalidraw/math";
 
 import type {
   AppState,
+  BoxSelectionMode,
   InteractiveCanvasAppState,
 } from "@excalidraw/excalidraw/types";
 
-import { getElementAbsoluteCoords, getElementBounds } from "./bounds";
+import {
+  boundsContainBounds,
+  doBoundsIntersect,
+  elementCenterPoint,
+  getElementAbsoluteCoords,
+  getElementBounds,
+  pointInsideBounds,
+} from "./bounds";
+import { intersectElementWithLineSegment } from "./collision";
 import { isElementInViewport } from "./sizeHelpers";
 import {
+  isArrowElement,
   isBoundToContainer,
   isFrameLikeElement,
+  isFreeDrawElement,
   isLinearElement,
   isTextElement,
 } from "./typeChecks";
@@ -17,19 +34,38 @@ import {
   elementOverlapsWithFrame,
   getContainingFrame,
   getFrameChildren,
+  isElementIntersectingFrame,
 } from "./frame";
 
 import { LinearElementEditor } from "./linearElementEditor";
 import { selectGroupsForSelectedElements } from "./groups";
+import { getBoundTextElement } from "./textElement";
 
 import type {
   ElementsMap,
   ElementsMapOrArray,
   ExcalidrawElement,
+  ExcalidrawFrameLikeElement,
   NonDeleted,
   NonDeletedExcalidrawElement,
 } from "./types";
 
+const shouldIgnoreElementFromSelection = (
+  element: NonDeletedExcalidrawElement,
+) => element.locked || isBoundToContainer(element);
+
+const excludeElementsFromFrames = <T extends ExcalidrawElement>(
+  selectedElements: readonly T[],
+  framesInSelection: Set<ExcalidrawFrameLikeElement["id"]>,
+) => {
+  return selectedElements.filter((element) => {
+    if (element.frameId && framesInSelection.has(element.frameId)) {
+      return false;
+    }
+    return true;
+  });
+};
+
 /**
  * Frames and their containing elements are not to be selected at the same time.
  * Given an array of selected elements, if there are frames and their containing elements
@@ -49,55 +85,243 @@ export const excludeElementsInFramesFromSelection = <
     }
   });
 
-  return selectedElements.filter((element) => {
+  return excludeElementsFromFrames(selectedElements, framesInSelection);
-    if (element.frameId && framesInSelection.has(element.frameId)) {
-      return false;
-    }
-    return true;
-  });
 };
 
 export const getElementsWithinSelection = (
   elements: readonly NonDeletedExcalidrawElement[],
   selection: NonDeletedExcalidrawElement,
   elementsMap: ElementsMap,
+  // TODO remove (this flag is effectively unused AFAIK)
   excludeElementsInFrames: boolean = true,
-) => {
+  boxSelectionMode: BoxSelectionMode = "contain",
-  const [selectionX1, selectionY1, selectionX2, selectionY2] =
+): NonDeletedExcalidrawElement[] => {
+  const [selectionStartX, selectionStartY, selectionEndX, selectionEndY] =
     getElementAbsoluteCoords(selection, elementsMap);
+  const selectionX1 = Math.min(selectionStartX, selectionEndX);
+  const selectionY1 = Math.min(selectionStartY, selectionEndY);
+  const selectionX2 = Math.max(selectionStartX, selectionEndX);
+  const selectionY2 = Math.max(selectionStartY, selectionEndY);
+  const selectionBounds = [
+    selectionX1,
+    selectionY1,
+    selectionX2,
+    selectionY2,
+  ] as Bounds;
+  const selectionEdges = [
+    lineSegment<GlobalPoint>(
+      pointFrom(selectionX1, selectionY1),
+      pointFrom(selectionX2, selectionY1),
+    ),
+    lineSegment<GlobalPoint>(
+      pointFrom(selectionX2, selectionY1),
+      pointFrom(selectionX2, selectionY2),
+    ),
+    lineSegment<GlobalPoint>(
+      pointFrom(selectionX2, selectionY2),
+      pointFrom(selectionX1, selectionY2),
+    ),
+    lineSegment<GlobalPoint>(
+      pointFrom(selectionX1, selectionY2),
+      pointFrom(selectionX1, selectionY1),
+    ),
+  ];
 
-  let elementsInSelection = elements.filter((element) => {
+  const framesInSelection = excludeElementsInFrames
-    let [elementX1, elementY1, elementX2, elementY2] = getElementBounds(
+    ? new Set<NonDeletedExcalidrawElement["id"]>()
-      element,
+    : null;
-      elementsMap,
+  let elementsInSelection: NonDeletedExcalidrawElement[] = [];
-    );
 
-    const containingFrame = getContainingFrame(element, elementsMap);
+  for (const element of elements) {
-    if (containingFrame) {
+    if (shouldIgnoreElementFromSelection(element)) {
-      const [fx1, fy1, fx2, fy2] = getElementBounds(
+      continue;
-        containingFrame,
-        elementsMap,
-      );
-
-      elementX1 = Math.max(fx1, elementX1);
-      elementY1 = Math.max(fy1, elementY1);
-      elementX2 = Math.min(fx2, elementX2);
-      elementY2 = Math.min(fy2, elementY2);
     }
 
-    return (
+    const strokeWidth = element.strokeWidth;
-      element.locked === false &&
+    let labelAABB: Bounds | null = null;
-      element.type !== "selection" &&
+    let elementAABB = getElementBounds(element, elementsMap);
-      !isBoundToContainer(element) &&
-      selectionX1 <= elementX1 &&
-      selectionY1 <= elementY1 &&
-      selectionX2 >= elementX2 &&
-      selectionY2 >= elementY2
-    );
-  });
 
-  elementsInSelection = excludeElementsInFrames
+    elementAABB = [
-    ? excludeElementsInFramesFromSelection(elementsInSelection)
+      elementAABB[0] - strokeWidth / 2,
+      elementAABB[1] - strokeWidth / 2,
+      elementAABB[2] + strokeWidth / 2,
+      elementAABB[3] + strokeWidth / 2,
+    ] as Bounds;
+
+    // Whether the element bounds should include the bound text element bounds
+    const boundTextElement =
+      isArrowElement(element) && getBoundTextElement(element, elementsMap);
+    if (boundTextElement) {
+      const { x, y } = LinearElementEditor.getBoundTextElementPosition(
+        element,
+        boundTextElement,
+        elementsMap,
+      );
+      labelAABB = [
+        x,
+        y,
+        x + boundTextElement.width,
+        y + boundTextElement.height,
+      ] as Bounds;
+    }
+
+    // Clip element bounds by its containing frame (if any), since only the
+    // visible (frame-clipped) portion of the element is relevant for selection.
+    const associatedFrame = getContainingFrame(element, elementsMap);
+    if (
+      associatedFrame &&
+      isElementIntersectingFrame(element, associatedFrame, elementsMap)
+    ) {
+      const frameAABB = getElementBounds(associatedFrame, elementsMap);
+      elementAABB = [
+        Math.max(elementAABB[0], frameAABB[0]),
+        Math.max(elementAABB[1], frameAABB[1]),
+        Math.min(elementAABB[2], frameAABB[2]),
+        Math.min(elementAABB[3], frameAABB[3]),
+      ] as Bounds;
+
+      labelAABB = labelAABB
+        ? ([
+            Math.max(labelAABB[0], frameAABB[0]),
+            Math.max(labelAABB[1], frameAABB[1]),
+            Math.min(labelAABB[2], frameAABB[2]),
+            Math.min(labelAABB[3], frameAABB[3]),
+          ] as Bounds)
+        : null;
+    }
+
+    const commonAABB = labelAABB
+      ? ([
+          Math.min(labelAABB[0], elementAABB[0]),
+          Math.min(labelAABB[1], elementAABB[1]),
+          Math.max(labelAABB[2], elementAABB[2]),
+          Math.max(labelAABB[3], elementAABB[3]),
+        ] as Bounds)
+      : elementAABB;
+
+    // ============== Evaluation ==============
+
+    // 1. If the selection box WRAPs the element's AABB, then add it to the
+    //    selection and move on, regardless of the selection mode.
+    //
+    //    PERF: This trick only works with axis-aligned box selection and the
+    //          current convex element shapes!
+    if (boundsContainBounds(selectionBounds, commonAABB)) {
+      if (framesInSelection && isFrameLikeElement(element)) {
+        framesInSelection.add(element.id);
+      } else {
+        elementsInSelection.push(element);
+        continue;
+      }
+    }
+
+    // 2. Handle the case where the label is overlapped by the selection box
+    if (
+      boxSelectionMode === "overlap" &&
+      labelAABB &&
+      doBoundsIntersect(selectionBounds, labelAABB)
+    ) {
+      elementsInSelection.push(element);
+      continue;
+    }
+
+    // 3. Handle the case where the selection is not wrapping the element, but
+    //    it does intersect the element's outline (non-AABB).
+    if (
+      boxSelectionMode === "overlap" &&
+      doBoundsIntersect(selectionBounds, elementAABB)
+    ) {
+      let hasIntersection = false;
+
+      // Preliminary check potential intersection imprecision
+      if (isLinearElement(element) || isFreeDrawElement(element)) {
+        const center = elementCenterPoint(element, elementsMap);
+        hasIntersection = element.points.some((point) => {
+          const rotatedPoint = pointRotateRads(
+            pointFrom<GlobalPoint>(element.x + point[0], element.y + point[1]),
+            center,
+            element.angle,
+          );
+
+          return pointInsideBounds(rotatedPoint, selectionBounds);
+        });
+      } else {
+        const nonRotatedElementBounds = getElementBounds(
+          element,
+          elementsMap,
+          true,
+        );
+        const center = elementCenterPoint(element, elementsMap);
+        hasIntersection = [
+          pointRotateRads(
+            pointFrom<GlobalPoint>(
+              (nonRotatedElementBounds[0] + nonRotatedElementBounds[2]) / 2,
+              nonRotatedElementBounds[1],
+            ),
+            center,
+            element.angle,
+          ),
+          pointRotateRads(
+            pointFrom<GlobalPoint>(
+              nonRotatedElementBounds[2],
+              (nonRotatedElementBounds[1] + nonRotatedElementBounds[3]) / 2,
+            ),
+            center,
+            element.angle,
+          ),
+          pointRotateRads(
+            pointFrom<GlobalPoint>(
+              (nonRotatedElementBounds[0] + nonRotatedElementBounds[2]) / 2,
+              nonRotatedElementBounds[3],
+            ),
+            center,
+            element.angle,
+          ),
+          pointRotateRads(
+            pointFrom<GlobalPoint>(
+              nonRotatedElementBounds[0],
+              (nonRotatedElementBounds[1] + nonRotatedElementBounds[3]) / 2,
+            ),
+            center,
+            element.angle,
+          ),
+        ].some((point) => {
+          return pointInsideBounds(
+            pointRotateRads(point, center, element.angle),
+            selectionBounds,
+          );
+        });
+      }
+
+      if (!hasIntersection) {
+        hasIntersection = selectionEdges.some(
+          (selectionEdge) =>
+            intersectElementWithLineSegment(
+              element,
+              elementsMap,
+              selectionEdge,
+              strokeWidth / 2,
+              true, // Stop at first hit for better performance
+            ).length > 0,
+        );
+      }
+
+      if (hasIntersection) {
+        if (framesInSelection && isFrameLikeElement(element)) {
+          framesInSelection.add(element.id);
+        }
+
+        elementsInSelection.push(element);
+        continue;
+      }
+    }
+
+    // 4. We don't need to handle when the selection is inside the element
+    //    as it is separately handled in App.
+  }
+
+  elementsInSelection = framesInSelection
+    ? excludeElementsFromFrames(elementsInSelection, framesInSelection)
     : elementsInSelection;
 
   elementsInSelection = elementsInSelection.filter((element) => {

packages/element/src/store.ts

@@ -111,6 +111,67 @@ export class Store {
     this.scheduleAction(CaptureUpdateAction.IMMEDIATELY);
   }
 
+  /**
+   * Commits a synthetic durable history entry without changing the live scene.
+   *
+   * Builds StoreSnapshot → StoreChange → StoreDelta from the provided
+   * logical before/after element maps and optional appState patches, then
+   * emits the resulting durable increment immediately through an isolated
+   * path that does not flush pending micro actions.
+   *
+   * appState patches are merged on top of the current observed appState
+   * baseline so only the provided keys participate in the synthetic diff.
+   */
+  public commitSyntheticIncrement(params: {
+    logicalBefore: {
+      elements: SceneElementsMap;
+      appState?: Partial<ObservedAppState>;
+    };
+    logicalAfter: {
+      elements: SceneElementsMap;
+      appState?: Partial<ObservedAppState>;
+    };
+  }): boolean {
+    const { logicalBefore, logicalAfter } = params;
+    const observedAppStateBaseline = this.snapshot.appState;
+    const syntheticAppStateBefore = logicalBefore.appState
+      ? { ...observedAppStateBaseline, ...logicalBefore.appState }
+      : observedAppStateBaseline;
+    const syntheticAppStateAfter = logicalAfter.appState
+      ? { ...observedAppStateBaseline, ...logicalAfter.appState }
+      : observedAppStateBaseline;
+    const didAppStateChange = Delta.isRightDifferent(
+      syntheticAppStateBefore,
+      syntheticAppStateAfter,
+    );
+    const prevSnapshot = StoreSnapshot.create(
+      logicalBefore.elements,
+      syntheticAppStateBefore,
+      {
+        didElementsChange: true,
+        didAppStateChange,
+      },
+    );
+    const nextSnapshot = StoreSnapshot.create(
+      logicalAfter.elements,
+      syntheticAppStateAfter,
+      {
+        didElementsChange: true,
+        didAppStateChange,
+      },
+    );
+    const change = StoreChange.create(prevSnapshot, nextSnapshot);
+    const delta = StoreDelta.calculate(prevSnapshot, nextSnapshot);
+
+    if (delta.isEmpty()) {
+      return false;
+    }
+
+    this.emitIsolatedDurableIncrement(change, delta);
+
+    return true;
+  }
+
   /**
    * Schedule special "micro" actions, to-be executed before the next commit, before it executes a scheduled "macro" action.
    */
@@ -206,6 +267,7 @@ export class Store {
   public clear(): void {
     this.snapshot = StoreSnapshot.empty();
     this.scheduledMacroActions = new Set();
+    this.scheduledMicroActions = [];
   }
 
   /**
@@ -245,6 +307,24 @@ export class Store {
     }
   }
 
+  /**
+   * Emits a synthetic durable increment immediately without draining the
+   * regular micro-action queue.
+   */
+  private emitIsolatedDurableIncrement(change: StoreChange, delta: StoreDelta) {
+    const nextSnapshot = this.applyChangeToSnapshot(change);
+
+    if (!nextSnapshot) {
+      return;
+    }
+
+    try {
+      this.emitDurableIncrement(nextSnapshot, change, delta);
+    } finally {
+      this.snapshot = nextSnapshot;
+    }
+  }
+
   /**
    * Performs change calculation and emits an ephemeral increment.
    *
@@ -491,6 +571,89 @@ export class EphemeralIncrement extends StoreIncrement {
   }
 }
 
+/**
+ * Serializable delta marker used to recover pre-tx undo baselines
+ * without rewriting history stack entries.
+ */
+export type TxUndoOverride = {
+  txId: string;
+  elementId: string;
+  prop: string;
+  expectedInsertedValue: unknown;
+  preTxBaselineValue: unknown;
+  consumedKey: string;
+};
+
+export type StoreDeltaMarkers = {
+  txUndoOverrides?: TxUndoOverride[];
+};
+
+const cloneTxUndoOverride = (override: TxUndoOverride): TxUndoOverride => ({
+  ...override,
+});
+
+const cloneStoreDeltaMarkers = (
+  markers: StoreDeltaMarkers | undefined,
+): StoreDeltaMarkers | undefined =>
+  markers
+    ? {
+        ...markers,
+        txUndoOverrides: markers.txUndoOverrides?.map(cloneTxUndoOverride),
+      }
+    : undefined;
+
+const pruneStoreDeltaMarkers = (delta: StoreDelta) => {
+  const txUndoOverrides = delta.markers?.txUndoOverrides;
+  if (!txUndoOverrides || txUndoOverrides.length === 0) {
+    return;
+  }
+
+  const updatedEntries = delta.elements.updated as Record<
+    string,
+    Delta<Record<string, unknown>>
+  >;
+  const nextTxUndoOverrides = txUndoOverrides.filter((override) => {
+    const updatedEntry = updatedEntries[override.elementId];
+    return (
+      !!updatedEntry &&
+      Object.prototype.hasOwnProperty.call(updatedEntry.inserted, override.prop)
+    );
+  });
+
+  if (nextTxUndoOverrides.length === txUndoOverrides.length) {
+    return;
+  }
+
+  if (nextTxUndoOverrides.length === 0) {
+    delta.markers = undefined;
+    return;
+  }
+
+  delta.markers = {
+    ...delta.markers,
+    txUndoOverrides: nextTxUndoOverrides.map(cloneTxUndoOverride),
+  };
+};
+
+export const mergeStoreDeltaMarkers = (
+  delta: StoreDelta,
+  markers: StoreDeltaMarkers,
+) => {
+  const txUndoOverrides = markers.txUndoOverrides ?? [];
+  if (txUndoOverrides.length === 0) {
+    return;
+  }
+
+  const existing = delta.markers?.txUndoOverrides ?? [];
+  delta.markers = {
+    ...delta.markers,
+    txUndoOverrides: [
+      ...existing.map(cloneTxUndoOverride),
+      ...txUndoOverrides.map(cloneTxUndoOverride),
+    ],
+  };
+};
+
 /**
  * Represents a captured delta by the Store.
  */
@@ -499,6 +662,7 @@ export class StoreDelta {
     public readonly id: string,
     public readonly elements: ElementsDelta,
     public readonly appState: AppStateDelta,
+    public markers?: StoreDeltaMarkers,
   ) {}
 
   /**
@@ -508,12 +672,16 @@ export class StoreDelta {
     elements: ElementsDelta,
     appState: AppStateDelta,
     opts: {
-      id: string;
+      id?: string;
-    } = {
+      markers?: StoreDeltaMarkers;
-      id: randomId(),
+    } = {},
-    },
   ) {
-    return new this(opts.id, elements, appState);
+    return new this(
+      opts.id ?? randomId(),
+      elements,
+      appState,
+      cloneStoreDeltaMarkers(opts.markers),
+    );
   }
 
   /**
@@ -538,11 +706,12 @@ export class StoreDelta {
    * Restore a store delta instance from a DTO.
    */
   public static restore(storeDeltaDTO: DTO<StoreDelta>) {
-    const { id, elements, appState } = storeDeltaDTO;
+    const { id, elements, appState, markers } = storeDeltaDTO;
     return new this(
       id,
       ElementsDelta.restore(elements),
       AppStateDelta.restore(appState),
+      cloneStoreDeltaMarkers(markers),
     );
   }
 
@@ -553,11 +722,12 @@ export class StoreDelta {
     id,
     elements: { added, removed, updated },
     appState: { delta: appStateDelta },
+    markers,
   }: DTO<StoreDelta>) {
     const elements = ElementsDelta.create(added, removed, updated);
     const appState = AppStateDelta.create(appStateDelta);
 
-    return new this(id, elements, appState);
+    return new this(id, elements, appState, cloneStoreDeltaMarkers(markers));
   }
 
   /**
@@ -569,8 +739,10 @@ export class StoreDelta {
     for (const delta of deltas) {
       aggregatedDelta.elements.squash(delta.elements);
       aggregatedDelta.appState.squash(delta.appState);
+      mergeStoreDeltaMarkers(aggregatedDelta, delta.markers ?? {});
     }
 
+    pruneStoreDeltaMarkers(aggregatedDelta);
     return aggregatedDelta;
   }
 
@@ -578,7 +750,12 @@ export class StoreDelta {
    * Inverse store delta, creates new instance of `StoreDelta`.
    */
   public static inverse(delta: StoreDelta) {
-    return this.create(delta.elements.inverse(), delta.appState.inverse());
+    const inversed = this.create(
+      delta.elements.inverse(),
+      delta.appState.inverse(),
+      { markers: delta.markers },
+    );
+    return inversed;
   }
 
   /**
@@ -614,7 +791,7 @@ export class StoreDelta {
     nextElements: SceneElementsMap,
     modifierOptions?: "deleted" | "inserted",
   ): StoreDelta {
-    return this.create(
+    const nextDelta = this.create(
       delta.elements.applyLatestChanges(
         prevElements,
         nextElements,
@@ -623,8 +800,11 @@ export class StoreDelta {
       delta.appState,
       {
         id: delta.id,
+        markers: delta.markers,
       },
     );
+    pruneStoreDeltaMarkers(nextDelta);
+    return nextDelta;
   }
 
   public static empty() {

packages/element/tests/collision.test.tsx

@@ -1,4 +1,4 @@
-import { arrayToMap } from "@excalidraw/common";
+import { arrayToMap, reseed } from "@excalidraw/common";
 import { type GlobalPoint, type LocalPoint, pointFrom } from "@excalidraw/math";
 import { Excalidraw } from "@excalidraw/excalidraw";
 import { API } from "@excalidraw/excalidraw/tests/helpers/api";
@@ -12,6 +12,7 @@ import { hitElementItself } from "../src/collision";
 describe("check rotated elements can be hit:", () => {
   beforeEach(async () => {
     localStorage.clear();
+    reseed(7);
     await render(<Excalidraw handleKeyboardGlobally={true} />);
   });
 
@@ -56,6 +57,7 @@ describe("hitElementItself cache", () => {
     });
 
     localStorage.clear();
+    reseed(7);
     await render(<Excalidraw handleKeyboardGlobally={true} />);
   });
 

packages/element/tests/store.test.ts

@@ -0,0 +1,140 @@
+import { API } from "@excalidraw/excalidraw/tests/helpers/api";
+
+import { arrayToMap } from "@excalidraw/common";
+
+import type App from "@excalidraw/excalidraw/components/App";
+
+import type { ObservedAppState } from "@excalidraw/excalidraw/types";
+import type {
+  ExcalidrawElement,
+  SceneElementsMap,
+} from "@excalidraw/element/types";
+
+import {
+  CaptureUpdateAction,
+  Store,
+  StoreSnapshot,
+  newElementWith,
+} from "../src";
+
+const getScheduledMicroActionCount = (store: Store) =>
+  (
+    store as unknown as {
+      scheduledMicroActions: Array<() => void>;
+    }
+  ).scheduledMicroActions.length;
+
+const flushMicroActions = (store: Store) => {
+  (
+    store as unknown as {
+      flushMicroActions: () => void;
+    }
+  ).flushMicroActions();
+};
+
+const toSceneElementsMap = (
+  elements: readonly ExcalidrawElement[],
+): SceneElementsMap => arrayToMap(elements) as SceneElementsMap;
+
+const createStoreHarness = (elements: SceneElementsMap) => {
+  const appState: ObservedAppState = StoreSnapshot.empty().appState;
+  const app = {
+    scene: {
+      getElementsMapIncludingDeleted: () => elements,
+    },
+    state: appState,
+  } as unknown as App;
+
+  const store = new Store(app);
+  store.snapshot = StoreSnapshot.create(elements, appState);
+
+  return { store, appState };
+};
+
+describe("Store synthetic increment isolation", () => {
+  it("keeps pending immediate micro actions queued across synthetic commit", () => {
+    const element = API.createElement({
+      type: "rectangle",
+      id: "store-isolated-immediate",
+      x: 0,
+      y: 0,
+    });
+    const baselineElements = toSceneElementsMap([element]);
+    const { store } = createStoreHarness(baselineElements);
+
+    const incrementTypes: Array<"durable" | "ephemeral"> = [];
+    const detach = store.onStoreIncrementEmitter.on((increment) => {
+      incrementTypes.push(increment.type);
+    });
+
+    store.scheduleMicroAction({
+      action: CaptureUpdateAction.IMMEDIATELY,
+      elements: [newElementWith(element, { y: 240 })],
+      appState: undefined,
+    });
+
+    expect(getScheduledMicroActionCount(store)).toBe(1);
+
+    const committed = store.commitSyntheticIncrement({
+      logicalBefore: {
+        elements: baselineElements,
+      },
+      logicalAfter: {
+        elements: toSceneElementsMap([newElementWith(element, { x: 120 })]),
+      },
+    });
+
+    expect(committed).toBe(true);
+    expect(incrementTypes).toEqual(["durable"]);
+    expect(getScheduledMicroActionCount(store)).toBe(1);
+
+    flushMicroActions(store);
+
+    expect(incrementTypes).toEqual(["durable", "durable"]);
+    expect(getScheduledMicroActionCount(store)).toBe(0);
+    detach();
+  });
+
+  it("keeps pending eventually micro actions queued across synthetic commit", () => {
+    const element = API.createElement({
+      type: "rectangle",
+      id: "store-isolated-eventually",
+      x: 0,
+      y: 0,
+    });
+    const baselineElements = toSceneElementsMap([element]);
+    const { store } = createStoreHarness(baselineElements);
+
+    const incrementTypes: Array<"durable" | "ephemeral"> = [];
+    const detach = store.onStoreIncrementEmitter.on((increment) => {
+      incrementTypes.push(increment.type);
+    });
+
+    store.scheduleMicroAction({
+      action: CaptureUpdateAction.EVENTUALLY,
+      elements: [newElementWith(element, { y: 240 })],
+      appState: undefined,
+    });
+
+    expect(getScheduledMicroActionCount(store)).toBe(1);
+
+    const committed = store.commitSyntheticIncrement({
+      logicalBefore: {
+        elements: baselineElements,
+      },
+      logicalAfter: {
+        elements: toSceneElementsMap([newElementWith(element, { x: 120 })]),
+      },
+    });
+
+    expect(committed).toBe(true);
+    expect(incrementTypes).toEqual(["durable"]);
+    expect(getScheduledMicroActionCount(store)).toBe(1);
+
+    flushMicroActions(store);
+
+    expect(incrementTypes).toEqual(["durable", "ephemeral"]);
+    expect(getScheduledMicroActionCount(store)).toBe(0);
+    detach();
+  });
+});

packages/excalidraw/appState.ts

@@ -128,6 +128,7 @@ export const getDefaultAppState = (): Omit<
     lockedMultiSelections: {},
     activeLockedId: null,
     bindMode: "orbit",
+    boxSelectionMode: "contain",
   };
 };
 
@@ -193,6 +194,7 @@ const APP_STATE_STORAGE_CONF = (<
   gridModeEnabled: { browser: true, export: true, server: true },
   height: { browser: false, export: false, server: false },
   isBindingEnabled: { browser: true, export: false, server: false },
+  boxSelectionMode: { browser: true, export: false, server: false },
   bindingPreference: { browser: true, export: false, server: false },
   isMidpointSnappingEnabled: { browser: true, export: false, server: false },
   defaultSidebarDockedPreference: {

packages/excalidraw/components/App.tsx

@@ -27,6 +27,7 @@ import {
   KEYS,
   APP_NAME,
   CURSOR_TYPE,
+  DEFAULT_TRANSFORM_HANDLE_SPACING,
   DEFAULT_MAX_IMAGE_WIDTH_OR_HEIGHT,
   DEFAULT_VERTICAL_ALIGN,
   DRAGGING_THRESHOLD,
@@ -360,6 +361,7 @@ import { restoreAppState, restoreElements } from "../data/restore";
 import { getCenter, getDistance } from "../gesture";
 import { History } from "../history";
 import { defaultLang, getLanguage, languages, setLanguage, t } from "../i18n";
+import { TransactionManager } from "../transaction";
 
 import {
   calculateScrollCenter,
@@ -636,7 +638,8 @@ class App extends React.Component<AppProps, AppState> {
   public library: AppClassProperties["library"];
   public libraryItemsFromStorage: LibraryItems | undefined;
   public id: string;
-  private store: Store;
+  public transactionManager: TransactionManager;
+  public store: Store;
   private history: History;
   public excalidrawContainerValue: {
     container: HTMLDivElement | null;
@@ -831,6 +834,8 @@ class App extends React.Component<AppProps, AppState> {
 
     this.store = new Store(this);
     this.history = new History(this.store);
+    this.transactionManager = new TransactionManager(this);
+    this.transactionManager.attachHistory(this.history);
 
     this.excalidrawContainerValue = {
       container: this.excalidrawContainerRef.current,
@@ -838,7 +843,6 @@ class App extends React.Component<AppProps, AppState> {
     };
 
     this.fonts = new Fonts(this.scene);
-    this.history = new History(this.store);
 
     this.actionManager.registerAll(actions);
     this.actionManager.registerAction(createUndoAction(this.history));
@@ -2524,6 +2528,7 @@ class App extends React.Component<AppProps, AppState> {
     const magicFrameChildren = getElementsOverlappingFrame(
       this.scene.getNonDeletedElements(),
       magicFrame,
+      this.scene.getNonDeletedElementsMap(),
     ).filter((el) => !isMagicFrameElement(el));
 
     if (!magicFrameChildren.length) {
@@ -4600,6 +4605,11 @@ class App extends React.Component<AppProps, AppState> {
     );
   };
 
+  /** Creates a new transaction for batching mutations into a single undo entry. */
+  public createTransaction: TransactionManager["create"] = () => {
+    return this.transactionManager.create();
+  };
+
   public mutateElement = <TElement extends Mutable<ExcalidrawElement>>(
     element: TElement,
     updates: ElementUpdate<TElement>,
@@ -7239,6 +7249,14 @@ class App extends React.Component<AppProps, AppState> {
           this.interactiveCanvas,
           isTextElement(hitElement) ? CURSOR_TYPE.TEXT : CURSOR_TYPE.CROSSHAIR,
         );
+      } else if (
+        !event[KEYS.CTRL_OR_CMD] &&
+        this.isHittingCommonBoundingBoxOfSelectedElements(
+          scenePointer,
+          selectedElements,
+        )
+      ) {
+        setCursor(this.interactiveCanvas, CURSOR_TYPE.MOVE);
       } else if (this.state.viewModeEnabled) {
         setCursor(this.interactiveCanvas, CURSOR_TYPE.GRAB);
       } else if (this.state.openDialog?.name === "elementLinkSelector") {
@@ -7730,17 +7748,24 @@ class App extends React.Component<AppProps, AppState> {
       const hitSelectedElement =
         pointerDownState.hit.element &&
         this.isASelectedElement(pointerDownState.hit.element);
+      const shouldForceLassoReselect =
+        event.altKey &&
+        event[KEYS.CTRL_OR_CMD] &&
+        !pointerDownState.resize.handleType;
+      const shouldStartLassoSelection =
+        shouldForceLassoReselect ||
+        (!pointerDownState.hit.hasHitCommonBoundingBoxOfSelectedElements &&
+          !pointerDownState.resize.handleType &&
+          !hitSelectedElement);
 
-      if (
+      if (shouldStartLassoSelection) {
-        !pointerDownState.hit.hasHitCommonBoundingBoxOfSelectedElements &&
+        if (!this.lassoTrail.hasCurrentTrail) {
-        !pointerDownState.resize.handleType &&
+          this.lassoTrail.startPath(
-        !hitSelectedElement
+            pointerDownState.origin.x,
-      ) {
+            pointerDownState.origin.y,
-        this.lassoTrail.startPath(
+            event.shiftKey,
-          pointerDownState.origin.x,
+          );
-          pointerDownState.origin.y,
+        }
-          event.shiftKey,
-        );
 
         // block dragging after lasso selection on PCs until the next pointer down
         // (on mobile or tablet, we want to allow user to drag immediately)
@@ -8729,12 +8754,14 @@ class App extends React.Component<AppProps, AppState> {
       DEFAULT_COLLISION_THRESHOLD / this.state.zoom.value,
       1,
     );
+    const boundsPadding =
+      (DEFAULT_TRANSFORM_HANDLE_SPACING * 2) / this.state.zoom.value;
     const [x1, y1, x2, y2] = getCommonBounds(selectedElements);
     return (
-      point.x > x1 - threshold &&
+      point.x > x1 - boundsPadding - threshold &&
-      point.x < x2 + threshold &&
+      point.x < x2 + boundsPadding + threshold &&
-      point.y > y1 - threshold &&
+      point.y > y1 - boundsPadding - threshold &&
-      point.y < y2 + threshold
+      point.y < y2 + boundsPadding + threshold
     );
   }
 
@@ -10267,6 +10294,7 @@ class App extends React.Component<AppProps, AppState> {
                 this.state.selectionElement,
                 this.scene.getNonDeletedElementsMap(),
                 false,
+                this.state.boxSelectionMode,
               )
             : [];
 

packages/excalidraw/components/RadioGroup.scss

@@ -26,13 +26,16 @@
     background: var(--RadioGroup-background);
     border: 1px solid var(--RadioGroup-border);
 
+    gap: 2px;
+
     &__choice {
       position: relative;
       display: flex;
       align-items: center;
       justify-content: center;
-      width: 32px;
+      min-width: 20px;
       height: 24px;
+      padding: 0 0.375rem;
 
       color: var(--RadioGroup-choice-color-off);
       background: var(--RadioGroup-choice-background-off);

packages/excalidraw/components/Stats/stats.test.tsx

@@ -750,7 +750,7 @@ describe("frame resizing behavior", () => {
       x: 0,
       y: 0,
       width: 100,
-      height: 100,
+      height: 103,
     });
 
     // Create a rectangle outside the frame

packages/excalidraw/components/dropdownMenu/DropdownMenu.scss

@@ -2,7 +2,7 @@
 
 .excalidraw {
   .dropdown-menu {
-    max-width: 16rem;
+    max-width: 20rem;
     z-index: 1;
 
     &--placement-top {

packages/excalidraw/components/dropdownMenu/DropdownMenuItemContentRadio.tsx

@@ -1,4 +1,5 @@
 import { useEditorInterface } from "../App";
+import { Ellipsify } from "../Ellipsify";
 import { RadioGroup } from "../RadioGroup";
 
 type Props<T> = {
@@ -12,6 +13,7 @@ type Props<T> = {
   onChange: (value: T) => void;
   children: React.ReactNode;
   name: string;
+  icon?: React.ReactNode;
 };
 
 const DropdownMenuItemContentRadio = <T,>({
@@ -21,13 +23,17 @@ const DropdownMenuItemContentRadio = <T,>({
   choices,
   children,
   name,
+  icon,
 }: Props<T>) => {
   const editorInterface = useEditorInterface();
 
   return (
     <>
       <div className="dropdown-menu-item-base dropdown-menu-item-bare">
-        <label className="dropdown-menu-item__text">{children}</label>
+        {icon && <div className="dropdown-menu-item__icon">{icon}</div>}
+        <label className="dropdown-menu-item__text">
+          <Ellipsify>{children}</Ellipsify>
+        </label>
         <RadioGroup
           name={name}
           value={value}

packages/excalidraw/components/main-menu/DefaultItems.tsx

@@ -39,7 +39,13 @@ import DropdownMenuItemCheckbox from "../dropdownMenu/DropdownMenuItemCheckbox";
 import DropdownMenuItemContentRadio from "../dropdownMenu/DropdownMenuItemContentRadio";
 import DropdownMenuItemLink from "../dropdownMenu/DropdownMenuItemLink";
 import DropdownMenuSub from "../dropdownMenu/DropdownMenuSub";
-import { GithubIcon, DiscordIcon, XBrandIcon, settingsIcon } from "../icons";
+import {
+  GithubIcon,
+  DiscordIcon,
+  XBrandIcon,
+  settingsIcon,
+  emptyIcon,
+} from "../icons";
 import {
   boltIcon,
   DeviceDesktopIcon,
@@ -427,6 +433,39 @@ const PreferencesToggleToolLockItem = () => {
   );
 };
 
+const PreferencesBoxSelectionModeItem = () => {
+  const { t } = useI18n();
+  const appState = useUIAppState();
+  const setAppState = useExcalidrawSetAppState();
+
+  return (
+    <DropdownMenuItemContentRadio<"contain" | "overlap">
+      name="boxSelectionMode"
+      icon={emptyIcon}
+      value={appState.boxSelectionMode}
+      onChange={(value) => {
+        setAppState({
+          boxSelectionMode: value,
+        });
+      }}
+      choices={[
+        {
+          value: "contain",
+          label: t("labels.boxSelectionContain"),
+          ariaLabel: t("labels.boxSelectionContain"),
+        },
+        {
+          value: "overlap",
+          label: t("labels.boxSelectionOverlap"),
+          ariaLabel: t("labels.boxSelectionOverlap"),
+        },
+      ]}
+    >
+      {t("labels.boxSelectionMode")}
+    </DropdownMenuItemContentRadio>
+  );
+};
+
 const PreferencesToggleSnapModeItem = () => {
   const { t } = useI18n();
   const actionManager = useExcalidrawActionManager();
@@ -568,6 +607,7 @@ export const Preferences = ({
       <DropdownMenuSub.Content className="excalidraw-main-menu-preferences-submenu">
         {children || (
           <>
+            <PreferencesBoxSelectionModeItem />
             <PreferencesToggleToolLockItem />
             <PreferencesToggleSnapModeItem />
             <PreferencesToggleGridModeItem />
@@ -585,6 +625,7 @@ export const Preferences = ({
 };
 
 Preferences.ToggleToolLock = PreferencesToggleToolLockItem;
+Preferences.BoxSelectionMode = PreferencesBoxSelectionModeItem;
 Preferences.ToggleSnapMode = PreferencesToggleSnapModeItem;
 Preferences.ToggleArrowBinding = PreferencesToggleArrowBindingItem;
 Preferences.ToggleMidpointSnapping = PreferencesToggleMidpointSnappingItem;

packages/excalidraw/data/index.ts

@@ -6,6 +6,7 @@ import {
   MIME_TYPES,
   cloneJSON,
   SVG_DOCUMENT_PREAMBLE,
+  arrayToMap,
 } from "@excalidraw/common";
 
 import { getNonDeletedElements } from "@excalidraw/element";
@@ -49,6 +50,7 @@ export const prepareElementsForExport = (
   exportSelectionOnly: boolean,
 ) => {
   elements = getNonDeletedElements(elements);
+  const elementsMap = arrayToMap(elements);
 
   const isExportingSelection =
     exportSelectionOnly &&
@@ -71,7 +73,11 @@ export const prepareElementsForExport = (
       isFrameLikeElement(exportedElements[0])
     ) {
       exportingFrame = exportedElements[0];
-      exportedElements = getElementsOverlappingFrame(elements, exportingFrame);
+      exportedElements = getElementsOverlappingFrame(
+        elements,
+        exportingFrame,
+        elementsMap,
+      );
     } else if (exportedElements.length > 1) {
       exportedElements = getSelectedElements(
         elements,

packages/excalidraw/data/restore.ts

@@ -936,6 +936,12 @@ export const restoreAppState = (
         : defaultValue;
   }
 
+  const boxSelectionMode =
+    appState.boxSelectionMode ?? localAppState?.boxSelectionMode;
+  if (boxSelectionMode !== undefined) {
+    nextAppState.boxSelectionMode = boxSelectionMode;
+  }
+
   return {
     ...nextAppState,
     cursorButton: localAppState?.cursorButton || "up",

packages/excalidraw/history.ts

@@ -87,10 +87,22 @@ export class HistoryChangedEvent {
   ) {}
 }
 
+export type HistoryBeforeRecordListener = (delta: StoreDelta) => void;
+export type HistoryPerformDirection = "undo" | "redo";
+export type HistoryEffectiveDeltaResolverContext = {
+  direction: HistoryPerformDirection;
+};
+export type HistoryEffectiveDeltaResolver = (
+  delta: HistoryDelta,
+  context: HistoryEffectiveDeltaResolverContext,
+) => HistoryDelta;
+
 export class History {
   public readonly onHistoryChangedEmitter = new Emitter<
     [HistoryChangedEvent]
   >();
+  private readonly onBeforeRecordEmitter = new Emitter<[StoreDelta]>();
+  private effectiveDeltaResolver: HistoryEffectiveDeltaResolver | null = null;
 
   public readonly undoStack: HistoryDelta[] = [];
   public readonly redoStack: HistoryDelta[] = [];
@@ -105,6 +117,20 @@ export class History {
 
   constructor(private readonly store: Store) {}
 
+  /**
+   * Registers a hook that runs before a durable delta is converted
+   * into a history entry.
+   */
+  public onBeforeRecord(callback: HistoryBeforeRecordListener) {
+    return this.onBeforeRecordEmitter.on(callback);
+  }
+
+  public setEffectiveDeltaResolver(
+    resolver: HistoryEffectiveDeltaResolver | null,
+  ) {
+    this.effectiveDeltaResolver = resolver;
+  }
+
   public clear() {
     this.undoStack.length = 0;
     this.redoStack.length = 0;
@@ -119,6 +145,8 @@ export class History {
       return;
     }
 
+    this.onBeforeRecordEmitter.trigger(delta);
+
     // construct history entry, so once it's emitted, it's not recorded again
     const historyDelta = HistoryDelta.inverse(delta);
 
@@ -131,15 +159,14 @@ export class History {
       this.redoStack.length = 0;
     }
 
-    this.onHistoryChangedEmitter.trigger(
+    this.emitHistoryChanged();
-      new HistoryChangedEvent(this.isUndoStackEmpty, this.isRedoStackEmpty),
-    );
   }
 
   public undo(elements: SceneElementsMap, appState: AppState) {
     return this.perform(
       elements,
       appState,
+      "undo",
       () => History.pop(this.undoStack),
       (entry: HistoryDelta) => History.push(this.redoStack, entry),
     );
@@ -149,6 +176,7 @@ export class History {
     return this.perform(
       elements,
       appState,
+      "redo",
       () => History.pop(this.redoStack),
       (entry: HistoryDelta) => History.push(this.undoStack, entry),
     );
@@ -157,6 +185,7 @@ export class History {
   private perform(
     elements: SceneElementsMap,
     appState: AppState,
+    direction: HistoryPerformDirection,
     pop: () => HistoryDelta | null,
     push: (entry: HistoryDelta) => void,
   ): [SceneElementsMap, AppState] | void {
@@ -177,9 +206,15 @@ export class History {
 
       // iterate through the history entries in case they result in no visible changes
       while (historyDelta) {
+        // Roundtrip invariant: whichever delta we execute must be the one that
+        // continues through applyLatestChanges -> inverse -> opposite stack.
+        let entryToPush = historyDelta;
         try {
+          const effectiveDelta = this.resolveEffectiveDelta(historyDelta, {
+            direction,
+          });
           [nextElements, nextAppState, containsVisibleChange] =
-            historyDelta.applyTo(nextElements, nextAppState, prevSnapshot);
+            effectiveDelta.applyTo(nextElements, nextAppState, prevSnapshot);
 
           const prevElements = prevSnapshot.elements;
           const nextSnapshot = prevSnapshot.maybeClone(
@@ -190,7 +225,7 @@ export class History {
 
           const change = StoreChange.create(prevSnapshot, nextSnapshot);
           const delta = HistoryDelta.applyLatestChanges(
-            historyDelta,
+            effectiveDelta,
             prevElements,
             nextElements,
           );
@@ -203,12 +238,12 @@ export class History {
               delta,
             });
 
-            historyDelta = delta;
+            entryToPush = delta;
           }
 
           prevSnapshot = nextSnapshot;
         } finally {
-          push(historyDelta);
+          push(entryToPush);
         }
 
         if (containsVisibleChange) {
@@ -222,12 +257,16 @@ export class History {
     } finally {
       // trigger the history change event before returning completely
       // also trigger it just once, no need doing so on each entry
-      this.onHistoryChangedEmitter.trigger(
+      this.emitHistoryChanged();
-        new HistoryChangedEvent(this.isUndoStackEmpty, this.isRedoStackEmpty),
-      );
     }
   }
 
+  private emitHistoryChanged() {
+    this.onHistoryChangedEmitter.trigger(
+      new HistoryChangedEvent(this.isUndoStackEmpty, this.isRedoStackEmpty),
+    );
+  }
+
   private static pop(stack: HistoryDelta[]): HistoryDelta | null {
     if (!stack.length) {
       return null;
@@ -246,4 +285,15 @@ export class History {
     const inversedEntry = HistoryDelta.inverse(entry);
     return stack.push(inversedEntry);
   }
+
+  private resolveEffectiveDelta(
+    delta: HistoryDelta,
+    context: HistoryEffectiveDeltaResolverContext,
+  ): HistoryDelta {
+    if (!this.effectiveDeltaResolver) {
+      return delta;
+    }
+
+    return this.effectiveDeltaResolver(delta, context);
+  }
 }

packages/excalidraw/locales/en.json

@@ -185,6 +185,9 @@
     "shapeSwitch": "Switch shape",
     "preferences": "Preferences",
     "preferences_toolLock": "Tool lock",
+    "boxSelectionMode": "Select on",
+    "boxSelectionContain": "Wrap",
+    "boxSelectionOverlap": "Overlap",
     "arrowBinding": "Arrow binding",
     "midpointSnapping": "Snap to midpoints"
   },

packages/excalidraw/package.json

@@ -83,13 +83,13 @@
     "@codemirror/language": "^6.0.0",
     "@codemirror/state": "^6.0.0",
     "@codemirror/view": "^6.0.0",
-    "@lezer/highlight": "^1.0.0",
     "@excalidraw/common": "0.18.0",
     "@excalidraw/element": "0.18.0",
     "@excalidraw/laser-pointer": "1.3.1",
     "@excalidraw/math": "0.18.0",
     "@excalidraw/mermaid-to-excalidraw": "2.2.2",
     "@excalidraw/random-username": "1.1.0",
+    "@lezer/highlight": "^1.0.0",
     "browser-fs-access": "0.38.0",
     "canvas-roundrect-polyfill": "0.0.1",
     "clsx": "1.1.1",

packages/excalidraw/scene/export.ts

@@ -157,7 +157,11 @@ const prepareElementsForRender = ({
   let nextElements: readonly ExcalidrawElement[];
 
   if (exportingFrame) {
-    nextElements = getElementsOverlappingFrame(elements, exportingFrame);
+    nextElements = getElementsOverlappingFrame(
+      elements,
+      exportingFrame,
+      arrayToMap(elements),
+    );
   } else if (frameRendering.enabled && frameRendering.name) {
     nextElements = addFrameLabelsAsTextElements(elements, {
       exportWithDarkMode,

packages/excalidraw/tests/__snapshots__/contextmenu.test.tsx.snap

@@ -13,6 +13,7 @@ exports[`contextMenu element > right-clicking on a group should select whole gro
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": {
     "items": [
@@ -1086,6 +1087,7 @@ exports[`contextMenu element > selecting 'Add to library' in context menu adds e
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -1300,6 +1302,7 @@ exports[`contextMenu element > selecting 'Bring forward' in context menu brings
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -1631,6 +1634,7 @@ exports[`contextMenu element > selecting 'Bring to front' in context menu brings
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -1962,6 +1966,7 @@ exports[`contextMenu element > selecting 'Copy styles' in context menu copies st
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -2176,6 +2181,7 @@ exports[`contextMenu element > selecting 'Delete' in context menu deletes elemen
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -2417,6 +2423,7 @@ exports[`contextMenu element > selecting 'Duplicate' in context menu duplicates
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -2715,6 +2722,7 @@ exports[`contextMenu element > selecting 'Group selection' in context menu group
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -3087,6 +3095,7 @@ exports[`contextMenu element > selecting 'Paste styles' in context menu pastes s
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -3580,6 +3589,7 @@ exports[`contextMenu element > selecting 'Send backward' in context menu sends e
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -3903,6 +3913,7 @@ exports[`contextMenu element > selecting 'Send to back' in context menu sends el
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -4226,6 +4237,7 @@ exports[`contextMenu element > selecting 'Ungroup selection' in context menu ung
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -4358,7 +4370,7 @@ exports[`contextMenu element > selecting 'Ungroup selection' in context menu ung
   "type": "rectangle",
   "updated": 1,
   "version": 5,
-  "versionNonce": 760410951,
+  "versionNonce": 1006504105,
   "width": 20,
   "x": -10,
   "y": 0,
@@ -4383,14 +4395,14 @@ exports[`contextMenu element > selecting 'Ungroup selection' in context menu ung
   "opacity": 100,
   "roughness": 1,
   "roundness": null,
-  "seed": 238820263,
+  "seed": 400692809,
   "strokeColor": "#1e1e1e",
   "strokeStyle": "solid",
   "strokeWidth": 2,
   "type": "rectangle",
   "updated": 1,
   "version": 5,
-  "versionNonce": 1006504105,
+  "versionNonce": 289600103,
   "width": 20,
   "x": 20,
   "y": 30,
@@ -4637,6 +4649,7 @@ exports[`contextMenu element > shows 'Group selection' in context menu for multi
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": {
     "items": [
@@ -5854,6 +5867,7 @@ exports[`contextMenu element > shows 'Ungroup selection' in context menu for gro
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": {
     "items": [
@@ -6864,7 +6878,7 @@ exports[`contextMenu element > shows 'Ungroup selection' in context menu for gro
   "type": "rectangle",
   "updated": 1,
   "version": 4,
-  "versionNonce": 747212839,
+  "versionNonce": 1723083209,
   "width": 10,
   "x": -10,
   "y": 0,
@@ -6891,14 +6905,14 @@ exports[`contextMenu element > shows 'Ungroup selection' in context menu for gro
   "opacity": 100,
   "roughness": 1,
   "roundness": null,
-  "seed": 238820263,
+  "seed": 400692809,
   "strokeColor": "#1e1e1e",
   "strokeStyle": "solid",
   "strokeWidth": 2,
   "type": "rectangle",
   "updated": 1,
   "version": 4,
-  "versionNonce": 1723083209,
+  "versionNonce": 760410951,
   "width": 10,
   "x": 12,
   "y": 0,
@@ -7122,6 +7136,7 @@ exports[`contextMenu element > shows context menu for canvas > [end of test] app
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": {
     "items": [
@@ -7811,6 +7826,7 @@ exports[`contextMenu element > shows context menu for element > [end of test] ap
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": {
     "items": [
@@ -8802,6 +8818,7 @@ exports[`contextMenu element > shows context menu for element > [end of test] ap
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": {
     "items": [

packages/excalidraw/tests/__snapshots__/history.test.tsx.snap

@@ -13,6 +13,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -646,6 +647,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -1207,6 +1209,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -1567,6 +1570,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -1929,6 +1933,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -2192,6 +2197,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -2645,6 +2651,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -2948,6 +2955,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -3267,6 +3275,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -3561,6 +3570,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -3847,6 +3857,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -4082,6 +4093,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -4339,6 +4351,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -4610,6 +4623,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -4839,6 +4853,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -5068,6 +5083,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -5315,6 +5331,7 @@ exports[`history > multiplayer undo/redo > conflicts in bound text elements and
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -5571,6 +5588,7 @@ exports[`history > multiplayer undo/redo > conflicts in frames and their childre
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -5829,6 +5847,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -6158,6 +6177,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -6585,6 +6605,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -6959,6 +6980,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
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   "croppingElementId": null,
@@ -7271,6 +7293,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -7563,6 +7586,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -7793,6 +7817,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -8145,6 +8170,7 @@ exports[`history > multiplayer undo/redo > should iterate through the history wh
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -8497,6 +8523,7 @@ exports[`history > multiplayer undo/redo > should not let remote changes to inte
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -8903,6 +8930,7 @@ exports[`history > multiplayer undo/redo > should not let remote changes to inte
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -9182,6 +9210,7 @@ exports[`history > multiplayer undo/redo > should not let remote changes to inte
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -9446,6 +9475,7 @@ exports[`history > multiplayer undo/redo > should not override remote changes on
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -9711,6 +9741,7 @@ exports[`history > multiplayer undo/redo > should not override remote changes on
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -9943,6 +9974,7 @@ exports[`history > multiplayer undo/redo > should override remotely added groups
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -10240,6 +10272,7 @@ exports[`history > multiplayer undo/redo > should override remotely added points
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -10557,6 +10590,7 @@ exports[`history > multiplayer undo/redo > should redistribute deltas when eleme
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -10793,6 +10827,7 @@ exports[`history > multiplayer undo/redo > should redraw arrows on undo > [end o
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -11718,6 +11753,7 @@ exports[`history > multiplayer undo/redo > should update history entries after r
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -11978,6 +12014,7 @@ exports[`history > singleplayer undo/redo > remounting undo/redo buttons should
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -12213,6 +12250,7 @@ exports[`history > singleplayer undo/redo > should clear the redo stack on eleme
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -12450,6 +12488,7 @@ exports[`history > singleplayer undo/redo > should create entry when selecting f
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -12841,6 +12880,7 @@ exports[`history > singleplayer undo/redo > should create new history entry on e
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -13051,6 +13091,7 @@ exports[`history > singleplayer undo/redo > should create new history entry on e
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -13258,6 +13299,7 @@ exports[`history > singleplayer undo/redo > should create new history entry on i
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -13559,6 +13601,7 @@ exports[`history > singleplayer undo/redo > should create new history entry on i
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -13857,6 +13900,7 @@ exports[`history > singleplayer undo/redo > should create new history entry on s
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -14102,6 +14146,7 @@ exports[`history > singleplayer undo/redo > should disable undo/redo buttons whe
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -14339,6 +14384,7 @@ exports[`history > singleplayer undo/redo > should end up with no history entry
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -14576,6 +14622,7 @@ exports[`history > singleplayer undo/redo > should iterate through the history w
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -14823,6 +14870,7 @@ exports[`history > singleplayer undo/redo > should not clear the redo stack on s
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -15154,6 +15202,7 @@ exports[`history > singleplayer undo/redo > should not collapse when applying co
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -15324,6 +15373,7 @@ exports[`history > singleplayer undo/redo > should not end up with history entry
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -15608,6 +15658,7 @@ exports[`history > singleplayer undo/redo > should not end up with history entry
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -15871,6 +15922,7 @@ exports[`history > singleplayer undo/redo > should not modify anything on unrela
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -16024,6 +16076,7 @@ exports[`history > singleplayer undo/redo > should not override appstate changes
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -16306,6 +16359,7 @@ exports[`history > singleplayer undo/redo > should support appstate name or view
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -16468,6 +16522,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -17216,6 +17271,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -17862,6 +17918,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -18508,6 +18565,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -19257,6 +19315,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -20025,6 +20084,7 @@ exports[`history > singleplayer undo/redo > should support changes in elements'
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -20505,6 +20565,7 @@ exports[`history > singleplayer undo/redo > should support duplication of groups
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -21016,6 +21077,7 @@ exports[`history > singleplayer undo/redo > should support element creation, del
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -21475,6 +21537,7 @@ exports[`history > singleplayer undo/redo > should support linear element creati
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,

packages/excalidraw/tests/__snapshots__/regressionTests.test.tsx.snap

@@ -13,6 +13,7 @@ exports[`given element A and group of elements B and given both are selected whe
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -439,6 +440,7 @@ exports[`given element A and group of elements B and given both are selected whe
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -855,6 +857,7 @@ exports[`regression tests > Cmd/Ctrl-click exclusively select element under poin
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -1421,6 +1424,7 @@ exports[`regression tests > Drags selected element when hitting only bounding bo
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -1628,6 +1632,7 @@ exports[`regression tests > adjusts z order when grouping > [end of test] appSta
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -2012,6 +2017,7 @@ exports[`regression tests > alt-drag duplicates an element > [end of test] appSt
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -2257,6 +2263,7 @@ exports[`regression tests > arrow keys > [end of test] appState 1`] = `
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -2437,6 +2444,7 @@ exports[`regression tests > can drag element that covers another element, while
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
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   "croppingElementId": null,
@@ -2762,6 +2770,7 @@ exports[`regression tests > change the properties of a shape > [end of test] app
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -3017,6 +3026,7 @@ exports[`regression tests > click on an element and drag it > [dragged] appState
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -3258,6 +3268,7 @@ exports[`regression tests > click on an element and drag it > [end of test] appS
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -3494,6 +3505,7 @@ exports[`regression tests > click to select a shape > [end of test] appState 1`]
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -3752,6 +3764,7 @@ exports[`regression tests > click-drag to select a group > [end of test] appStat
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -4066,6 +4079,7 @@ exports[`regression tests > deleting last but one element in editing group shoul
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -4502,6 +4516,7 @@ exports[`regression tests > deselects group of selected elements on pointer down
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -4785,6 +4800,7 @@ exports[`regression tests > deselects group of selected elements on pointer up w
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -5061,6 +5077,7 @@ exports[`regression tests > deselects selected element on pointer down when poin
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -5269,6 +5286,7 @@ exports[`regression tests > deselects selected element, on pointer up, when clic
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -5469,6 +5487,7 @@ exports[`regression tests > double click to edit a group > [end of test] appStat
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -5862,6 +5881,7 @@ exports[`regression tests > drags selected elements from point inside common bou
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -6159,6 +6179,7 @@ exports[`regression tests > draw every type of shape > [end of test] appState 1`
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -6947,6 +6968,7 @@ exports[`regression tests > given a group of selected elements with an element t
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -7281,6 +7303,7 @@ exports[`regression tests > given a selected element A and a not selected elemen
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -7560,6 +7583,7 @@ exports[`regression tests > given selected element A with lower z-index than uns
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -7795,6 +7819,7 @@ exports[`regression tests > given selected element A with lower z-index than uns
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -8035,6 +8060,7 @@ exports[`regression tests > key 2 selects rectangle tool > [end of test] appStat
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -8215,6 +8241,7 @@ exports[`regression tests > key 3 selects diamond tool > [end of test] appState
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -8395,6 +8422,7 @@ exports[`regression tests > key 4 selects ellipse tool > [end of test] appState
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -8575,6 +8603,7 @@ exports[`regression tests > key 5 selects arrow tool > [end of test] appState 1`
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -8807,6 +8836,7 @@ exports[`regression tests > key 6 selects line tool > [end of test] appState 1`]
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -9037,6 +9067,7 @@ exports[`regression tests > key 7 selects freedraw tool > [end of test] appState
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -9229,6 +9260,7 @@ exports[`regression tests > key a selects arrow tool > [end of test] appState 1`
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -9461,6 +9493,7 @@ exports[`regression tests > key d selects diamond tool > [end of test] appState
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -9641,6 +9674,7 @@ exports[`regression tests > key l selects line tool > [end of test] appState 1`]
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -9871,6 +9905,7 @@ exports[`regression tests > key o selects ellipse tool > [end of test] appState
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -10051,6 +10086,7 @@ exports[`regression tests > key p selects freedraw tool > [end of test] appState
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -10243,6 +10279,7 @@ exports[`regression tests > key r selects rectangle tool > [end of test] appStat
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -10423,6 +10460,7 @@ exports[`regression tests > make a group and duplicate it > [end of test] appSta
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -10954,6 +10992,7 @@ exports[`regression tests > noop interaction after undo shouldn't create history
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -11234,6 +11273,7 @@ exports[`regression tests > pinch-to-zoom works > [end of test] appState 1`] = `
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -11357,6 +11397,7 @@ exports[`regression tests > shift click on selected element should deselect it o
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -11557,6 +11598,7 @@ exports[`regression tests > shift-click to multiselect, then drag > [end of test
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -11876,6 +11918,7 @@ exports[`regression tests > should group elements and ungroup them > [end of tes
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -12305,6 +12348,7 @@ exports[`regression tests > single-clicking on a subgroup of a selected group sh
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -12945,6 +12989,7 @@ exports[`regression tests > spacebar + drag scrolls the canvas > [end of test] a
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -13071,6 +13116,7 @@ exports[`regression tests > supports nested groups > [end of test] appState 1`]
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -13702,6 +13748,7 @@ exports[`regression tests > switches from group of selected elements to another
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -14041,6 +14088,7 @@ exports[`regression tests > switches selected element on pointer down > [end of
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -14305,6 +14353,7 @@ exports[`regression tests > two-finger scroll works > [end of test] appState 1`]
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -14428,6 +14477,7 @@ exports[`regression tests > undo/redo drawing an element > [end of test] appStat
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -14792,6 +14842,7 @@ exports[`regression tests > updates fontSize & fontFamily appState > [end of tes
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,
@@ -14915,6 +14966,7 @@ exports[`regression tests > zoom hotkeys > [end of test] appState 1`] = `
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,

packages/excalidraw/tests/history.test.tsx

@@ -314,7 +314,7 @@ describe("history", () => {
         expect.objectContaining({ id: rect2.id, isDeleted: true }),
       ]);
 
-      mouse.downAt(0, 0);
+      mouse.downAt(-10, -10);
       mouse.moveTo(25, 25);
       mouse.moveTo(50, 50);
       mouse.upAt(50, 50);

packages/excalidraw/tests/regressionTests.test.tsx

@@ -468,7 +468,7 @@ describe("regression tests", () => {
     mouse.reset();
     mouse.down();
     mouse.move(-1000, -1000);
-    mouse.restorePosition(...end);
+    mouse.restorePosition(end[0] + 3, end[1] + 3);
     mouse.up();
 
     expect(h.elements.length).toBe(3);
@@ -519,7 +519,7 @@ describe("regression tests", () => {
     mouse.reset();
     mouse.down();
     mouse.move(-1000, -1000);
-    mouse.restorePosition(...end);
+    mouse.restorePosition(end[0] + 3, end[1] + 3);
     mouse.up();
 
     for (const element of h.elements) {
@@ -537,7 +537,7 @@ describe("regression tests", () => {
     mouse.moveTo(-10, -10); // the NW resizing handle is at [0, 0], so moving further
     mouse.down();
     mouse.move(-1000, -1000);
-    mouse.restorePosition(...end);
+    mouse.restorePosition(end[0] + 3, end[1] + 3);
     mouse.up();
 
     Keyboard.withModifierKeys({ ctrl: true, shift: true }, () => {

packages/excalidraw/tests/selection.test.tsx

@@ -1,7 +1,9 @@
 import React from "react";
 import { vi } from "vitest";
 
-import { KEYS, reseed } from "@excalidraw/common";
+import { KEYS, ROUNDNESS, reseed } from "@excalidraw/common";
+import { getElementBounds, getElementLineSegments } from "@excalidraw/element";
+import { pointFrom, pointRotateRads, type LocalPoint } from "@excalidraw/math";
 
 import { SHAPES } from "../components/shapes";
 
@@ -12,6 +14,7 @@ import * as StaticScene from "../renderer/staticScene";
 import { API } from "./helpers/api";
 import { Keyboard, Pointer, UI } from "./helpers/ui";
 import {
+  act,
   render,
   fireEvent,
   mockBoundingClientRect,
@@ -39,6 +42,19 @@ const { h } = window;
 
 const mouse = new Pointer("mouse");
 
+const getOutlineBounds = (element: ReturnType<typeof API.createElement>) => {
+  const sceneElement = API.getElement(element);
+  const elementsMap = h.scene.getNonDeletedElementsMap();
+  const points = getElementLineSegments(sceneElement, elementsMap).flat();
+
+  return [
+    Math.min(...points.map((point) => point[0])),
+    Math.min(...points.map((point) => point[1])),
+    Math.max(...points.map((point) => point[0])),
+    Math.max(...points.map((point) => point[1])),
+  ] as const;
+};
+
 describe("box-selection", () => {
   beforeEach(async () => {
     await render(<Excalidraw />);
@@ -108,6 +124,497 @@ describe("box-selection", () => {
 
     assertSelectedElements([]);
   });
+
+  it("should not select an element when the selection box only partially overlaps it", () => {
+    const rect1 = API.createElement({
+      type: "rectangle",
+      x: 0,
+      y: 0,
+      width: 50,
+      height: 50,
+      backgroundColor: "red",
+      fillStyle: "solid",
+    });
+
+    API.setElements([rect1]);
+
+    mouse.downAt(25, -20);
+    mouse.move(-1000, -1000);
+    mouse.moveTo(75, 70);
+    mouse.up();
+
+    assertSelectedElements([]);
+  });
+});
+
+describe("lasso reselection", () => {
+  beforeEach(async () => {
+    await render(<Excalidraw />);
+  });
+
+  it("should allow ctrl+alt lasso reselection when starting inside the active common bounds", () => {
+    const rectA = API.createElement({
+      type: "rectangle",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      backgroundColor: "red",
+      fillStyle: "solid",
+    });
+    const rectB = API.createElement({
+      type: "rectangle",
+      x: 220,
+      y: 0,
+      width: 100,
+      height: 100,
+      backgroundColor: "blue",
+      fillStyle: "solid",
+    });
+
+    API.setElements([rectA, rectB]);
+    mouse.select([rectA, rectB]);
+    act(() => {
+      h.app.setActiveTool({ type: "lasso" });
+    });
+
+    Keyboard.withModifierKeys({ ctrl: true, alt: true }, () => {
+      mouse.downAt(110, 50);
+      mouse.moveTo(50, -20);
+
+      expect(h.app.lassoTrail.hasCurrentTrail).toBe(true);
+
+      mouse.moveTo(-20, 50);
+      mouse.moveTo(50, 120);
+      mouse.moveTo(110, 50);
+      mouse.up();
+    });
+
+    assertSelectedElements([rectA.id]);
+  });
+});
+
+describe("box-selection overlap mode", () => {
+  const boxSelect = (
+    startX: number,
+    startY: number,
+    endX: number,
+    endY: number,
+  ) => {
+    mouse.downAt(startX, startY);
+    mouse.move(-1000, -1000);
+    mouse.moveTo(endX, endY);
+    mouse.up();
+  };
+
+  const boxSelectTopLeftAabbCorner = (
+    element: ReturnType<typeof API.createElement>,
+  ) => {
+    const sceneElement = API.getElement(element);
+    const elementsMap = h.scene.getNonDeletedElementsMap();
+    const [x1, y1] = getElementBounds(sceneElement, elementsMap);
+
+    boxSelect(x1 + 2, y1 + 2, x1 + 12, y1 + 12);
+  };
+
+  const boxSelectTopRightAabbCorner = (
+    element: ReturnType<typeof API.createElement>,
+  ) => {
+    const sceneElement = API.getElement(element);
+    const elementsMap = h.scene.getNonDeletedElementsMap();
+    const [, y1, x2] = getElementBounds(sceneElement, elementsMap);
+
+    boxSelect(x2 - 12, y1 + 2, x2 - 2, y1 + 12);
+  };
+
+  const boxSelectTopLeftRotatedLocalBoundsCorner = (
+    element: ReturnType<typeof API.createElement>,
+  ) => {
+    const sceneElement = API.getElement(element);
+    const elementsMap = h.scene.getNonDeletedElementsMap();
+    const [x1, y1, x2, y2] = getElementBounds(sceneElement, elementsMap, true);
+    const center = pointFrom((x1 + x2) / 2, (y1 + y2) / 2);
+    const [cornerX, cornerY] = pointRotateRads(
+      pointFrom(x1, y1),
+      center,
+      sceneElement.angle,
+    );
+
+    boxSelect(cornerX - 4, cornerY - 4, cornerX + 4, cornerY + 4);
+  };
+
+  beforeEach(async () => {
+    await render(
+      <Excalidraw
+        initialData={{ appState: { boxSelectionMode: "overlap" } }}
+      />,
+    );
+  });
+
+  it("should select an element when the selection box partially overlaps it", () => {
+    const rect1 = API.createElement({
+      type: "rectangle",
+      x: 0,
+      y: 0,
+      width: 50,
+      height: 50,
+      backgroundColor: "red",
+      fillStyle: "solid",
+    });
+
+    API.setElements([rect1]);
+
+    boxSelect(25, -20, 75, 70);
+
+    assertSelectedElements([rect1.id]);
+  });
+
+  it("should not select a transparent rectangle when the selection box stays inside it", () => {
+    const rect1 = API.createElement({
+      type: "rectangle",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      backgroundColor: "transparent",
+      fillStyle: "solid",
+    });
+
+    API.setElements([rect1]);
+
+    boxSelect(25, 25, 75, 75);
+
+    assertSelectedElements([]);
+  });
+
+  it("should select a transparent rectangle when the selection box crosses its outline", () => {
+    const rect1 = API.createElement({
+      type: "rectangle",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      backgroundColor: "transparent",
+      fillStyle: "solid",
+    });
+
+    API.setElements([rect1]);
+
+    boxSelect(25, 25, 125, 75);
+
+    assertSelectedElements([rect1.id]);
+  });
+
+  it("should not select a rotated transparent rectangle when the selection box stays inside it", () => {
+    const rect1 = API.createElement({
+      type: "rectangle",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      angle: Math.PI / 4,
+      backgroundColor: "transparent",
+      fillStyle: "solid",
+    });
+
+    API.setElements([rect1]);
+
+    boxSelect(40, 40, 60, 60);
+
+    assertSelectedElements([]);
+  });
+
+  it("should select a rotated rounded rectangle when the selection box contains its outline but not its bounds", () => {
+    const rect = API.createElement({
+      type: "rectangle",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 180,
+      angle: Math.PI / 6,
+      backgroundColor: "transparent",
+      fillStyle: "solid",
+      roundness: { type: ROUNDNESS.ADAPTIVE_RADIUS },
+      roughness: 0,
+    });
+
+    API.setElements([rect]);
+
+    const sceneRect = API.getElement(rect);
+    const elementsMap = h.scene.getNonDeletedElementsMap();
+    const [boundsX1, boundsY1, boundsX2, boundsY2] = getElementBounds(
+      sceneRect,
+      elementsMap,
+    );
+    const [outlineX1, outlineY1, outlineX2, outlineY2] = getOutlineBounds(rect);
+
+    expect(outlineX1).toBeGreaterThan(boundsX1 - 1);
+    expect(outlineY1).toBeGreaterThan(boundsY1 - 1);
+    expect(outlineX2).toBeLessThan(boundsX2 + 1);
+    expect(outlineY2).toBeLessThan(boundsY2 + 1);
+
+    boxSelect(
+      outlineX1 - (outlineX1 - boundsX1) / 2,
+      outlineY1 - (outlineY1 - boundsY1) / 2,
+      outlineX2 + (boundsX2 - outlineX2) / 2,
+      outlineY2 + (boundsY2 - outlineY2) / 2,
+    );
+
+    assertSelectedElements([rect.id]);
+  });
+
+  it("should not select a filled rotated rectangle when the selection box only overlaps its axis-aligned bounds", () => {
+    const rect = API.createElement({
+      type: "rectangle",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      angle: Math.PI / 4,
+      backgroundColor: "red",
+      fillStyle: "solid",
+    });
+
+    API.setElements([rect]);
+
+    boxSelectTopLeftAabbCorner(rect);
+
+    assertSelectedElements([]);
+  });
+
+  it("should not select a filled ellipse when the selection box only overlaps its bounds corner", () => {
+    const ellipse = API.createElement({
+      type: "ellipse",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      backgroundColor: "red",
+      fillStyle: "solid",
+    });
+
+    API.setElements([ellipse]);
+
+    boxSelectTopRightAabbCorner(ellipse);
+
+    assertSelectedElements([]);
+  });
+
+  it("should not select a filled diamond when the selection box only overlaps its bounds corner", () => {
+    const diamond = API.createElement({
+      type: "diamond",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      backgroundColor: "red",
+      fillStyle: "solid",
+    });
+
+    API.setElements([diamond]);
+
+    boxSelectTopRightAabbCorner(diamond);
+
+    assertSelectedElements([]);
+  });
+
+  it("should not select a filled rotated ellipse when the selection box only overlaps its axis-aligned bounds", () => {
+    const ellipse = API.createElement({
+      type: "ellipse",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      angle: Math.PI / 4,
+      backgroundColor: "red",
+      fillStyle: "solid",
+    });
+
+    API.setElements([ellipse]);
+
+    boxSelectTopLeftRotatedLocalBoundsCorner(ellipse);
+
+    assertSelectedElements([]);
+  });
+
+  it("should not select a filled rotated diamond when the selection box only overlaps its rotated local bounds", () => {
+    const diamond = API.createElement({
+      type: "diamond",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      angle: Math.PI / 4,
+      backgroundColor: "red",
+      fillStyle: "solid",
+    });
+
+    API.setElements([diamond]);
+
+    boxSelectTopLeftRotatedLocalBoundsCorner(diamond);
+
+    assertSelectedElements([]);
+  });
+
+  it("should not select rotated text when the selection box only overlaps its axis-aligned bounds", () => {
+    const text = API.createElement({
+      type: "text",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      angle: Math.PI / 4,
+      text: "test",
+    });
+
+    API.setElements([text]);
+
+    boxSelect(-18, -18, -8, -8);
+
+    assertSelectedElements([]);
+  });
+
+  it("should not select rotated image when the selection box only overlaps its axis-aligned bounds", () => {
+    const image = API.createElement({
+      type: "image",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      angle: Math.PI / 4,
+      fileId: "file_A",
+      status: "saved",
+    });
+
+    API.setElements([image]);
+
+    boxSelect(-18, -18, -8, -8);
+
+    assertSelectedElements([]);
+  });
+
+  it("should deselect a selected rotated rectangle when clicking in the empty corner of its axis-aligned bounds", () => {
+    const rect = API.createElement({
+      type: "rectangle",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      angle: Math.PI / 4,
+      backgroundColor: "red",
+      fillStyle: "solid",
+    });
+
+    API.setElements([rect]);
+
+    mouse.clickAt(50, 50);
+    assertSelectedElements([rect.id]);
+
+    const sceneRect = API.getElement(rect);
+    const elementsMap = h.scene.getNonDeletedElementsMap();
+    const [x1, y1] = getElementBounds(sceneRect, elementsMap);
+
+    mouse.clickAt(x1 + 2, y1 + 2);
+
+    assertSelectedElements([]);
+  });
+
+  it("should not select a line when the selection box only overlaps its bounds", () => {
+    const line = API.createElement({
+      type: "line",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      backgroundColor: "transparent",
+      points: [pointFrom<LocalPoint>(0, 0), pointFrom<LocalPoint>(100, 100)],
+    });
+
+    API.setElements([line]);
+
+    boxSelect(20, 50, 30, 60);
+
+    assertSelectedElements([]);
+  });
+
+  it("should not click-select rotated freedraw in the corner of its axis-aligned bounds", () => {
+    const freedraw = API.createElement({
+      type: "freedraw",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      angle: Math.PI / 4,
+      backgroundColor: "transparent",
+      points: [
+        pointFrom<LocalPoint>(0, 0),
+        pointFrom<LocalPoint>(100, 0),
+        pointFrom<LocalPoint>(100, 100),
+        pointFrom<LocalPoint>(0, 100),
+        pointFrom<LocalPoint>(0, 0),
+      ],
+    });
+
+    API.setElements([freedraw]);
+
+    const sceneFreedraw = API.getElement(freedraw);
+    const elementsMap = h.scene.getNonDeletedElementsMap();
+    const [x1, y1] = getElementBounds(sceneFreedraw, elementsMap);
+
+    mouse.clickAt(x1 + 2, y1 + 2);
+
+    assertSelectedElements([]);
+  });
+
+  it("should not select a freedraw when the selection box only overlaps its bounds", () => {
+    const freedraw = API.createElement({
+      type: "freedraw",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      backgroundColor: "transparent",
+      points: [
+        pointFrom<LocalPoint>(0, 0),
+        pointFrom<LocalPoint>(50, 50),
+        pointFrom<LocalPoint>(100, 100),
+      ],
+    });
+
+    API.setElements([freedraw]);
+
+    boxSelect(20, 50, 30, 60);
+
+    assertSelectedElements([]);
+  });
+
+  it("should not select a transparent framed element when the selection box stays inside its clipped bounds", () => {
+    const frame = API.createElement({
+      type: "frame",
+      x: 0,
+      y: 0,
+      width: 100,
+      height: 100,
+      backgroundColor: "transparent",
+      fillStyle: "solid",
+    });
+    const rect1 = API.createElement({
+      type: "rectangle",
+      x: 50,
+      y: 10,
+      width: 100,
+      height: 80,
+      frameId: frame.id,
+      backgroundColor: "transparent",
+      fillStyle: "solid",
+    });
+
+    API.setElements([frame, rect1]);
+
+    boxSelect(60, 20, 90, 60);
+
+    assertSelectedElements([]);
+  });
 });
 
 describe("inner box-selection", () => {

packages/excalidraw/tests/test-utils.ts

@@ -449,29 +449,28 @@ const stripProps = (
   }, {} as Record<string, any>);
 
 export const checkpointHistory = (history: History, name: string) => {
-  expect(
+  const normalizeHistoryEntry = (entry: History["undoStack"][number]) => {
-    history.undoStack.map((x) => ({
+    const { markers, ...rest } = entry;
-      ...x,
-      elements: {
-        ...x.elements,
-        added: stripProps(x.elements.added, ["seed", "versionNonce"]),
-        removed: stripProps(x.elements.removed, ["seed", "versionNonce"]),
-        updated: stripProps(x.elements.updated, ["seed", "versionNonce"]),
-      },
-    })),
-  ).toMatchSnapshot(`[${name}] undo stack`);
 
-  expect(
+    return {
-    history.redoStack.map((x) => ({
+      ...rest,
-      ...x,
+      ...(markers ? { markers } : {}),
       elements: {
-        ...x.elements,
+        ...entry.elements,
-        added: stripProps(x.elements.added, ["seed", "versionNonce"]),
+        added: stripProps(entry.elements.added, ["seed", "versionNonce"]),
-        removed: stripProps(x.elements.removed, ["seed", "versionNonce"]),
+        removed: stripProps(entry.elements.removed, ["seed", "versionNonce"]),
-        updated: stripProps(x.elements.updated, ["seed", "versionNonce"]),
+        updated: stripProps(entry.elements.updated, ["seed", "versionNonce"]),
       },
-    })),
+    };
-  ).toMatchSnapshot(`[${name}] redo stack`);
+  };
+
+  expect(history.undoStack.map(normalizeHistoryEntry)).toMatchSnapshot(
+    `[${name}] undo stack`,
+  );
+
+  expect(history.redoStack.map(normalizeHistoryEntry)).toMatchSnapshot(
+    `[${name}] redo stack`,
+  );
 };
 
 /**

packages/excalidraw/transaction/diff.ts

@@ -0,0 +1,289 @@
+import { type StoreDelta } from "@excalidraw/element";
+
+import type { Delta } from "@excalidraw/element";
+
+import type { Mutable } from "@excalidraw/common/utility-types";
+import type {
+  ExcalidrawElement,
+  OrderedExcalidrawElement,
+  SceneElementsMap,
+} from "@excalidraw/element/types";
+
+import type {
+  ElementChange,
+  ElementPropName,
+  TouchedElementProps,
+} from "./types";
+
+const LEDGER_IGNORED_PROPS = new Set([
+  "version",
+  "versionNonce",
+  "seed",
+  "updated",
+  "index",
+]);
+
+export const TX_UNDO_OVERRIDE_IGNORED_PROPS = new Set([
+  "version",
+  "versionNonce",
+  "isDeleted",
+]);
+
+type ElementRecord = Record<string, unknown>;
+export type ElementUpdatedProps = Omit<
+  Partial<OrderedExcalidrawElement>,
+  "id" | "updated" | "seed"
+>;
+export type ElementUpdatedPropName = Extract<keyof ElementUpdatedProps, string>;
+type ElementPropValueMap = ElementUpdatedProps;
+
+export type ElementUpdatedEntry = Delta<ElementPropValueMap>;
+export type ElementUpdatedEntryMap = Record<string, ElementUpdatedEntry>;
+
+const isPlainObject = (value: unknown): value is Record<string, unknown> =>
+  !!value && typeof value === "object" && !Array.isArray(value);
+
+export const getElementProp = <TProp extends ElementPropName>(
+  element: ExcalidrawElement,
+  prop: TProp,
+): ExcalidrawElement[TProp] =>
+  (element as ElementRecord)[prop] as ExcalidrawElement[TProp];
+
+export const setOrderedElementProp = <TProp extends ElementPropName>(
+  element: Mutable<OrderedExcalidrawElement>,
+  prop: TProp,
+  value: OrderedExcalidrawElement[TProp],
+) => {
+  (element as ElementRecord)[prop] = value;
+};
+
+/** Deep equality used by ledger conflict/touched-prop detection. */
+export const isLedgerValueEqual = (left: unknown, right: unknown): boolean => {
+  if (Object.is(left, right)) {
+    return true;
+  }
+
+  if (Array.isArray(left) && Array.isArray(right)) {
+    if (left.length !== right.length) {
+      return false;
+    }
+    for (let index = 0; index < left.length; index += 1) {
+      if (!isLedgerValueEqual(left[index], right[index])) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  if (isPlainObject(left) && isPlainObject(right)) {
+    const leftKeys = Object.keys(left);
+    const rightKeys = Object.keys(right);
+    if (leftKeys.length !== rightKeys.length) {
+      return false;
+    }
+    for (const key of leftKeys) {
+      if (!Object.prototype.hasOwnProperty.call(right, key)) {
+        return false;
+      }
+      if (!isLedgerValueEqual(left[key], right[key])) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  return false;
+};
+
+/** Shallow-copies a scene map. Entries share references with the original. */
+export const shallowCopySceneElements = (
+  elements: ReadonlyMap<string, ExcalidrawElement>,
+): SceneElementsMap => new Map(elements) as SceneElementsMap;
+
+export const createAllTouchedElementProps = (): TouchedElementProps => ({
+  kind: "all",
+});
+
+export const createPartialTouchedElementProps = (
+  props: Iterable<ElementPropName> = [],
+): TouchedElementProps => ({
+  kind: "partial",
+  props: new Set(props),
+});
+
+export const hasTouchedProps = (touchedProps: TouchedElementProps): boolean =>
+  touchedProps.kind === "all" || touchedProps.props.size > 0;
+
+export const touchesWholeElement = (
+  touchedProps: TouchedElementProps,
+): boolean => touchedProps.kind === "all";
+
+export const isPartialTouchedProps = (
+  touchedProps: TouchedElementProps,
+): touchedProps is Extract<TouchedElementProps, { kind: "partial" }> =>
+  touchedProps.kind === "partial";
+
+export const hasTouchedProp = (
+  touchedProps: TouchedElementProps,
+  prop: ElementPropName,
+): boolean => touchedProps.kind === "all" || touchedProps.props.has(prop);
+
+export const mergeTouchedProps = (
+  left: TouchedElementProps,
+  right: TouchedElementProps,
+): TouchedElementProps => {
+  if (left.kind === "all" || right.kind === "all") {
+    return createAllTouchedElementProps();
+  }
+
+  return createPartialTouchedElementProps([...left.props, ...right.props]);
+};
+
+/** Returns changed property names between two element snapshots. */
+export const collectTouchedProps = (
+  before: ExcalidrawElement | null,
+  after: ExcalidrawElement | null,
+): TouchedElementProps => {
+  if (!before || !after) {
+    return createAllTouchedElementProps();
+  }
+
+  const touchedProps = new Set<ElementPropName>();
+  const keys = new Set<ElementPropName>([
+    ...(Object.keys(before) as ElementPropName[]),
+    ...(Object.keys(after) as ElementPropName[]),
+  ]);
+
+  for (const key of keys) {
+    if (LEDGER_IGNORED_PROPS.has(key)) {
+      continue;
+    }
+    if (
+      !isLedgerValueEqual(
+        getElementProp(before, key),
+        getElementProp(after, key),
+      )
+    ) {
+      touchedProps.add(key);
+    }
+  }
+
+  return createPartialTouchedElementProps(touchedProps);
+};
+
+/** Returns ids whose element snapshot changed between two points in time. */
+export const collectChangedElementIds = (
+  before: ReadonlyMap<string, ExcalidrawElement>,
+  after: ReadonlyMap<string, ExcalidrawElement>,
+) => collectElementChanges(before, after).map((change) => change.id);
+
+export const collectElementChanges = (
+  before: ReadonlyMap<string, ExcalidrawElement>,
+  after: ReadonlyMap<string, ExcalidrawElement>,
+): ElementChange[] => {
+  const changes: ElementChange[] = [];
+  const candidateIds = new Set<string>([...before.keys(), ...after.keys()]);
+
+  for (const id of candidateIds) {
+    const beforeElement = before.get(id) ?? null;
+    const afterElement = after.get(id) ?? null;
+    const touchedProps = collectTouchedProps(beforeElement, afterElement);
+    if (!hasTouchedProps(touchedProps)) {
+      continue;
+    }
+
+    changes.push({
+      id,
+      before: beforeElement,
+      after: afterElement,
+      touchedProps,
+    });
+  }
+
+  return changes;
+};
+
+export const serializeConsumedPropKey = (
+  elementId: string,
+  prop: ElementPropName,
+) => `${elementId}\u0000${prop}`;
+
+export const getUpdatedElementEntries = (delta: StoreDelta) =>
+  delta.elements.updated as ElementUpdatedEntryMap;
+
+export const getElementPropEntries = (props: ElementPropValueMap) =>
+  Object.entries(props) as [
+    ElementUpdatedPropName,
+    ElementUpdatedProps[ElementUpdatedPropName],
+  ][];
+
+export const hasUpdatedElementEntries = (delta: StoreDelta) =>
+  Object.keys(getUpdatedElementEntries(delta)).length > 0;
+
+export const serializeIntermediateValue = (value: unknown): string => {
+  const serialize = (input: unknown, seen: WeakSet<object>): string => {
+    if (input === null) {
+      return "null";
+    }
+
+    switch (typeof input) {
+      case "undefined":
+        return "undefined";
+      case "boolean":
+        return input ? "boolean:true" : "boolean:false";
+      case "number":
+        if (Number.isNaN(input)) {
+          return "number:NaN";
+        }
+        if (Object.is(input, -0)) {
+          return "number:-0";
+        }
+        return `number:${input}`;
+      case "bigint":
+        return `bigint:${input.toString()}`;
+      case "string":
+        return `string:${JSON.stringify(input)}`;
+      case "symbol":
+        return `symbol:${String(input)}`;
+      case "function":
+        return `function:${input.name}`;
+      case "object":
+        break;
+      default:
+        return `unknown:${String(input)}`;
+    }
+
+    if (Array.isArray(input)) {
+      if (seen.has(input)) {
+        return "[CircularArray]";
+      }
+      seen.add(input);
+      const serialized = `[${input
+        .map((item) => serialize(item, seen))
+        .join(",")}]`;
+      seen.delete(input);
+      return serialized;
+    }
+
+    if (isPlainObject(input)) {
+      if (seen.has(input)) {
+        return "{CircularObject}";
+      }
+      seen.add(input);
+      const serialized = `{${Object.keys(input)
+        .sort()
+        .map((key) => `${JSON.stringify(key)}:${serialize(input[key], seen)}`)
+        .join(",")}}`;
+      seen.delete(input);
+      return serialized;
+    }
+
+    try {
+      return `object:${JSON.stringify(input)}`;
+    } catch {
+      return `object:${Object.prototype.toString.call(input)}`;
+    }
+  };
+
+  return serialize(value, new WeakSet<object>());
+};

packages/excalidraw/transaction/index.ts

@@ -0,0 +1,13 @@
+export { collectChangedElementIds } from "./diff";
+export { TransactionLedger } from "./ledger";
+export { Transaction } from "./transaction";
+export { TransactionManager } from "./manager";
+
+export type {
+  AppStateResolver,
+  AppStateResolverContext,
+  TransactionElementUpdate,
+  TransactionLedgerEntry,
+  TransactionStatus,
+  TransactionSummary,
+} from "./types";

packages/excalidraw/transaction/ledger.ts

@@ -0,0 +1,333 @@
+import { deepCopyElement } from "@excalidraw/element";
+
+import type { Mutable } from "@excalidraw/common/utility-types";
+import type {
+  ExcalidrawElement,
+  OrderedExcalidrawElement,
+  SceneElementsMap,
+} from "@excalidraw/element/types";
+
+import {
+  collectElementChanges,
+  collectTouchedProps,
+  getElementProp,
+  hasTouchedProps,
+  isLedgerValueEqual,
+  mergeTouchedProps,
+  setOrderedElementProp,
+  shallowCopySceneElements,
+  touchesWholeElement,
+} from "./diff";
+
+import type { TransactionLedgerEntry } from "./types";
+
+/**
+ * Keeps transaction-level scene mutations and materializes synthetic snapshots
+ * for a single durable history commit.
+ */
+export class TransactionLedger {
+  private readonly entries = new Map<string, TransactionLedgerEntry>();
+
+  /** Whether the transaction has any net element mutations. */
+  hasEntries() {
+    return this.entries.size > 0;
+  }
+
+  /** Returns the ledger entry for an element, if any. */
+  getEntry(elementId: string): TransactionLedgerEntry | undefined {
+    return this.entries.get(elementId);
+  }
+
+  /** Releases all ledger entries. */
+  clear() {
+    this.entries.clear();
+  }
+
+  /** Records one element mutation step into the ledger. */
+  recordStep(
+    before: ReadonlyMap<string, ExcalidrawElement>,
+    after: ReadonlyMap<string, ExcalidrawElement>,
+  ) {
+    for (const change of collectElementChanges(before, after)) {
+      const {
+        id: elementId,
+        before: beforeElement,
+        after: afterElement,
+        touchedProps,
+      } = change;
+
+      const existing = this.entries.get(elementId);
+      if (!existing) {
+        this.entries.set(elementId, {
+          baselineElement: beforeElement
+            ? deepCopyElement(beforeElement)
+            : null,
+          targetElement: afterElement ? deepCopyElement(afterElement) : null,
+          touchedProps,
+        });
+        continue;
+      }
+
+      existing.targetElement = afterElement
+        ? deepCopyElement(afterElement)
+        : null;
+      existing.touchedProps = mergeTouchedProps(
+        existing.touchedProps,
+        touchedProps,
+      );
+
+      // Created then deleted inside one transaction leaves no durable footprint.
+      if (!existing.baselineElement && !existing.targetElement) {
+        this.entries.delete(elementId);
+        continue;
+      }
+      if (!existing.baselineElement && existing.targetElement?.isDeleted) {
+        this.entries.delete(elementId);
+      }
+    }
+  }
+
+  /**
+   * Builds synthetic element before/after snapshots with a fixed
+   * "live-wins-per-prop" strategy.
+   */
+  buildSyntheticSnapshots(live: ReadonlyMap<string, ExcalidrawElement>) {
+    // Shallow copy — untouched elements stay as live references.
+    // Only elements mutated in-place (prop-level updates) are deep-copied below.
+    const elementsBefore = shallowCopySceneElements(live);
+    const elementsAfter = shallowCopySceneElements(live);
+
+    for (const [elementId, entry] of this.entries) {
+      this.reconcileEntrySnapshots(
+        elementId,
+        entry,
+        live,
+        elementsBefore,
+        elementsAfter,
+      );
+    }
+
+    return { elementsBefore, elementsAfter };
+  }
+
+  private reconcileEntrySnapshots(
+    elementId: string,
+    entry: TransactionLedgerEntry,
+    live: ReadonlyMap<string, ExcalidrawElement>,
+    elementsBefore: SceneElementsMap,
+    elementsAfter: SceneElementsMap,
+  ) {
+    if (!entry.baselineElement) {
+      this.applyCreatedElementSnapshots(
+        elementId,
+        entry.targetElement,
+        live,
+        elementsBefore,
+        elementsAfter,
+      );
+      return;
+    }
+
+    if (!entry.targetElement) {
+      this.applyDeletedElementSnapshots(
+        elementId,
+        entry.baselineElement,
+        live,
+        elementsBefore,
+        elementsAfter,
+      );
+      return;
+    }
+
+    this.applyUpdatedElementSnapshots(
+      elementId,
+      entry,
+      live,
+      elementsBefore,
+      elementsAfter,
+    );
+  }
+
+  private applyCreatedElementSnapshots(
+    elementId: string,
+    targetElement: ExcalidrawElement | null,
+    live: ReadonlyMap<string, ExcalidrawElement>,
+    elementsBefore: SceneElementsMap,
+    elementsAfter: SceneElementsMap,
+  ) {
+    if (!targetElement) {
+      return;
+    }
+
+    const liveElement = live.get(elementId) ?? null;
+    if (
+      !liveElement ||
+      liveElement.isDeleted ||
+      hasTouchedProps(collectTouchedProps(targetElement, liveElement))
+    ) {
+      return;
+    }
+
+    elementsBefore.delete(elementId);
+    elementsAfter.set(
+      elementId,
+      deepCopyElement(targetElement) as OrderedExcalidrawElement,
+    );
+  }
+
+  private applyDeletedElementSnapshots(
+    elementId: string,
+    baselineElement: ExcalidrawElement,
+    live: ReadonlyMap<string, ExcalidrawElement>,
+    elementsBefore: SceneElementsMap,
+    elementsAfter: SceneElementsMap,
+  ) {
+    const liveElement = live.get(elementId) ?? null;
+    if (liveElement && !liveElement.isDeleted) {
+      return;
+    }
+
+    elementsBefore.set(
+      elementId,
+      deepCopyElement(baselineElement) as OrderedExcalidrawElement,
+    );
+    elementsAfter.delete(elementId);
+  }
+
+  private applyUpdatedElementSnapshots(
+    elementId: string,
+    entry: TransactionLedgerEntry,
+    live: ReadonlyMap<string, ExcalidrawElement>,
+    elementsBefore: SceneElementsMap,
+    elementsAfter: SceneElementsMap,
+  ) {
+    const liveElement = live.get(elementId) ?? null;
+    const targetElement = entry.targetElement;
+    const baselineElement = entry.baselineElement;
+    const beforeElement = elementsBefore.get(elementId);
+    const afterElement = elementsAfter.get(elementId);
+
+    if (
+      !liveElement ||
+      !baselineElement ||
+      !targetElement ||
+      !beforeElement ||
+      !afterElement
+    ) {
+      return;
+    }
+
+    if (touchesWholeElement(entry.touchedProps)) {
+      this.applyWholeElementSnapshots(
+        elementId,
+        baselineElement,
+        targetElement,
+        liveElement,
+        elementsBefore,
+        elementsAfter,
+      );
+      return;
+    }
+
+    this.applyPerPropSnapshots({
+      entry,
+      liveElement,
+      baselineElement,
+      targetElement,
+      beforeElement,
+      afterElement,
+      elementId,
+      elementsBefore,
+      elementsAfter,
+    });
+  }
+
+  private applyWholeElementSnapshots(
+    elementId: string,
+    baselineElement: ExcalidrawElement,
+    targetElement: ExcalidrawElement,
+    liveElement: ExcalidrawElement,
+    elementsBefore: SceneElementsMap,
+    elementsAfter: SceneElementsMap,
+  ) {
+    const hasLiveConflict = hasTouchedProps(
+      collectTouchedProps(targetElement, liveElement),
+    );
+    if (hasLiveConflict) {
+      return;
+    }
+
+    elementsBefore.set(
+      elementId,
+      deepCopyElement(baselineElement) as OrderedExcalidrawElement,
+    );
+    elementsAfter.set(
+      elementId,
+      deepCopyElement(targetElement) as OrderedExcalidrawElement,
+    );
+  }
+
+  private applyPerPropSnapshots(args: {
+    entry: TransactionLedgerEntry;
+    liveElement: ExcalidrawElement;
+    baselineElement: ExcalidrawElement;
+    targetElement: ExcalidrawElement;
+    beforeElement: ExcalidrawElement;
+    afterElement: ExcalidrawElement;
+    elementId: string;
+    elementsBefore: SceneElementsMap;
+    elementsAfter: SceneElementsMap;
+  }) {
+    const {
+      entry,
+      liveElement,
+      baselineElement,
+      targetElement,
+      beforeElement,
+      afterElement,
+      elementId,
+      elementsBefore,
+      elementsAfter,
+    } = args;
+
+    // Deep-copy before mutating so we never touch live elements.
+    const mutableBefore = deepCopyElement(
+      beforeElement,
+    ) as Mutable<OrderedExcalidrawElement>;
+    const mutableAfter = deepCopyElement(
+      afterElement,
+    ) as Mutable<OrderedExcalidrawElement>;
+    elementsBefore.set(elementId, mutableBefore as OrderedExcalidrawElement);
+    elementsAfter.set(elementId, mutableAfter as OrderedExcalidrawElement);
+
+    if (entry.touchedProps.kind !== "partial") {
+      return;
+    }
+
+    let appliedProps = 0;
+    for (const prop of entry.touchedProps.props) {
+      const liveValue = getElementProp(liveElement, prop);
+      const targetValue = getElementProp(targetElement, prop);
+      if (!isLedgerValueEqual(liveValue, targetValue)) {
+        continue;
+      }
+
+      setOrderedElementProp(
+        mutableBefore,
+        prop,
+        getElementProp(baselineElement, prop),
+      );
+      setOrderedElementProp(mutableAfter, prop, targetValue);
+      appliedProps += 1;
+    }
+
+    if (appliedProps === 0) {
+      return;
+    }
+
+    mutableBefore.version = baselineElement.version;
+    mutableBefore.versionNonce = baselineElement.versionNonce;
+    mutableAfter.version = targetElement.version;
+    mutableAfter.versionNonce = targetElement.versionNonce;
+  }
+}

packages/excalidraw/transaction/manager.ts

@@ -0,0 +1,291 @@
+import {
+  Delta,
+  ElementsDelta,
+  mergeStoreDeltaMarkers,
+  type StoreDelta,
+  type TxUndoOverride,
+} from "@excalidraw/element";
+
+import type { Mutable } from "@excalidraw/common/utility-types";
+
+import {
+  HistoryDelta,
+  type HistoryBeforeRecordListener,
+  type HistoryEffectiveDeltaResolverContext,
+} from "../history";
+
+import {
+  type ElementUpdatedPropName,
+  getUpdatedElementEntries,
+  hasUpdatedElementEntries,
+  isLedgerValueEqual,
+  type ElementUpdatedProps,
+  type ElementUpdatedEntryMap,
+} from "./diff";
+import { Transaction } from "./transaction";
+
+import type { AppClassProperties } from "../types";
+import type { TransactionStatus } from "./types";
+
+type TransactionRecord = {
+  tx: Transaction | null;
+  phase: TransactionStatus;
+};
+type TransactionHistoryBridge = {
+  onBeforeRecord: (callback: HistoryBeforeRecordListener) => () => void;
+  setEffectiveDeltaResolver: (
+    resolver:
+      | ((
+          delta: HistoryDelta,
+          context: HistoryEffectiveDeltaResolverContext,
+        ) => HistoryDelta)
+      | null,
+  ) => void;
+};
+
+type MutableElementUpdatedProps = Mutable<ElementUpdatedProps>;
+
+const setElementUpdatedOverride = (
+  overrides: MutableElementUpdatedProps,
+  prop: ElementUpdatedPropName,
+  value: unknown,
+) => {
+  (overrides as Record<ElementUpdatedPropName, unknown>)[prop] = value;
+};
+
+/**
+ * Thin factory that holds the app reference and creates Transaction instances.
+ */
+export class TransactionManager {
+  private readonly app: AppClassProperties;
+  /**
+   * Single authoritative lifecycle registry for transactions.
+   *
+   * We retain ended/canceled metadata after the tx object is released because
+   * history markers only persist `txId`; undo/redo still needs to resolve
+   * whether a tx was active or already ended when applying effective deltas.
+   */
+  private readonly transactionRecords = new Map<string, TransactionRecord>();
+  /**
+   * Active transaction ids ordered by most-recent registration first.
+   * This preserves deterministic priority when multiple active txs overlap on
+   * the same element+prop and compete to reserve override markers.
+   */
+  private readonly activeTransactionIdsByPriority: string[] = [];
+  private detachBeforeRecordHook: (() => void) | null = null;
+
+  constructor(app: AppClassProperties) {
+    this.app = app;
+  }
+
+  /**
+   * Binds transaction bookkeeping to history lifecycle hooks.
+   * Call once during app initialization.
+   */
+  attachHistory(history: TransactionHistoryBridge) {
+    this.detachBeforeRecordHook?.();
+    history.setEffectiveDeltaResolver((delta, context) =>
+      this.resolveEffectiveDelta(delta, context),
+    );
+    this.detachBeforeRecordHook = history.onBeforeRecord((delta) =>
+      this.onDurableIncrement(delta),
+    );
+  }
+
+  private removeActiveTransactionId(txId: string) {
+    const txIndex = this.activeTransactionIdsByPriority.indexOf(txId);
+    if (txIndex >= 0) {
+      this.activeTransactionIdsByPriority.splice(txIndex, 1);
+    }
+  }
+
+  private getRequiredTransactionRecord(txId: string): TransactionRecord {
+    const record = this.transactionRecords.get(txId);
+    if (!record) {
+      throw new Error(`Unknown transaction: ${txId}`);
+    }
+
+    return record;
+  }
+
+  registerTransaction(tx: Transaction) {
+    this.transactionRecords.set(tx.id, {
+      tx,
+      phase: "active",
+    });
+    this.activeTransactionIdsByPriority.unshift(tx.id);
+  }
+
+  detachTransactionInstance(txId: string) {
+    const record = this.getRequiredTransactionRecord(txId);
+    record.tx = null;
+    this.removeActiveTransactionId(txId);
+  }
+
+  getStatus(txId: string): TransactionStatus {
+    return this.getRequiredTransactionRecord(txId).phase;
+  }
+
+  private markTransactionFinished(
+    txId: string,
+    phase: Exclude<TransactionStatus, "active">,
+  ): TransactionStatus {
+    const record = this.getRequiredTransactionRecord(txId);
+    if (record.phase !== "active") {
+      return record.phase;
+    }
+
+    record.phase = phase;
+    this.removeActiveTransactionId(txId);
+    return record.phase;
+  }
+
+  markTransactionCommitted(txId: string): TransactionStatus {
+    return this.markTransactionFinished(txId, "committed");
+  }
+
+  markTransactionCanceled(txId: string): TransactionStatus {
+    return this.markTransactionFinished(txId, "canceled");
+  }
+
+  onDurableIncrement(delta: StoreDelta) {
+    if (this.activeTransactionIdsByPriority.length === 0) {
+      return;
+    }
+    if (!hasUpdatedElementEntries(delta)) {
+      return;
+    }
+
+    const txUndoOverrides = this.collectUndoOverrides(delta);
+    if (txUndoOverrides.length === 0) {
+      return;
+    }
+
+    mergeStoreDeltaMarkers(delta, { txUndoOverrides });
+  }
+
+  private collectUndoOverrides(delta: StoreDelta): TxUndoOverride[] {
+    const overrides: TxUndoOverride[] = [];
+    const reservedConsumedKeys = new Set<string>();
+
+    for (const txId of this.activeTransactionIdsByPriority) {
+      const record = this.transactionRecords.get(txId);
+      if (!record || record.phase !== "active" || !record.tx) {
+        continue;
+      }
+
+      const txOverrides = record.tx.collectUndoOverridesForDelta(
+        delta,
+        reservedConsumedKeys,
+      );
+
+      for (const override of txOverrides) {
+        if (reservedConsumedKeys.has(override.consumedKey)) {
+          continue;
+        }
+
+        reservedConsumedKeys.add(override.consumedKey);
+        overrides.push(override);
+      }
+    }
+
+    return overrides;
+  }
+
+  private resolveEffectiveDelta(
+    delta: HistoryDelta,
+    _context: HistoryEffectiveDeltaResolverContext,
+  ): HistoryDelta {
+    const txUndoOverrides = delta.markers?.txUndoOverrides;
+    if (!txUndoOverrides || txUndoOverrides.length === 0) {
+      return delta;
+    }
+
+    const updatedEntries = getUpdatedElementEntries(delta);
+    const insertedOverridesByElement = new Map<
+      string,
+      MutableElementUpdatedProps
+    >();
+
+    for (const override of txUndoOverrides) {
+      if (!this.shouldApplyUndoOverride(override.txId)) {
+        continue;
+      }
+
+      const currentEntry = updatedEntries[override.elementId];
+      if (!currentEntry) {
+        continue;
+      }
+
+      const prop = override.prop as ElementUpdatedPropName;
+      const currentInsertedValue = currentEntry.inserted[prop];
+      if (
+        !isLedgerValueEqual(
+          currentInsertedValue,
+          override.expectedInsertedValue,
+        )
+      ) {
+        // Guard against over-applying once the delta has already evolved.
+        continue;
+      }
+
+      const elementOverrides = insertedOverridesByElement.get(
+        override.elementId,
+      );
+      if (elementOverrides) {
+        setElementUpdatedOverride(
+          elementOverrides,
+          prop,
+          override.preTxBaselineValue,
+        );
+      } else {
+        const nextOverrides: MutableElementUpdatedProps = {};
+        setElementUpdatedOverride(
+          nextOverrides,
+          prop,
+          override.preTxBaselineValue,
+        );
+        insertedOverridesByElement.set(override.elementId, nextOverrides);
+      }
+    }
+
+    if (insertedOverridesByElement.size === 0) {
+      return delta;
+    }
+
+    const nextUpdatedEntries: ElementUpdatedEntryMap = {
+      ...updatedEntries,
+    };
+    for (const [elementId, insertedOverrides] of insertedOverridesByElement) {
+      const currentEntry = updatedEntries[elementId];
+      if (!currentEntry) {
+        continue;
+      }
+
+      nextUpdatedEntries[elementId] = Delta.create(
+        { ...currentEntry.deleted },
+        { ...currentEntry.inserted, ...insertedOverrides },
+      );
+    }
+
+    const effectiveElements = ElementsDelta.create(
+      delta.elements.added,
+      delta.elements.removed,
+      nextUpdatedEntries,
+    );
+
+    return HistoryDelta.create(effectiveElements, delta.appState, {
+      id: delta.id,
+      markers: delta.markers,
+    }) as HistoryDelta;
+  }
+
+  private shouldApplyUndoOverride(txId: string): boolean {
+    const record = this.transactionRecords.get(txId);
+    return !!record && record.phase !== "active";
+  }
+
+  create(): Transaction {
+    return new Transaction(this.app, this);
+  }
+}

packages/excalidraw/transaction/transaction.ts

@@ -0,0 +1,286 @@
+import { randomId } from "@excalidraw/common";
+import {
+  CaptureUpdateAction,
+  newElementWith,
+  type ElementUpdate,
+  type StoreDelta,
+  type TxUndoOverride,
+} from "@excalidraw/element";
+
+import { shallowCopySceneElements } from "./diff";
+import { TransactionLedger } from "./ledger";
+
+import {
+  type AppStateResolver,
+  type AppStateResolverContext,
+  type TransactionElementOfType,
+  type TransactionElementUpdate,
+  type TransactionStatus,
+  type TransactionSummary,
+} from "./types";
+import { TxUndoOverridePlanner } from "./undoOverridePlanner";
+
+import type { TransactionManager } from "./manager";
+import type {
+  AppClassProperties,
+  AppState,
+  ObservedAppState,
+  SceneData,
+} from "../types";
+
+type CommitOptions = {
+  resolveAppState?: AppStateResolver;
+};
+
+/**
+ * A transaction that records mutations via `updateScene(NEVER)` and commits
+ * a single synthetic durable history entry at the end.
+ */
+export class Transaction {
+  public readonly id = `tx-${randomId()}`;
+
+  private readonly app: AppClassProperties;
+  private readonly manager: TransactionManager;
+  private readonly ledger = new TransactionLedger();
+  private readonly undoOverridePlanner = new TxUndoOverridePlanner();
+  private readonly initialAppState: Partial<ObservedAppState>;
+
+  private accumulatedAppState: Record<string, unknown> = {};
+  private cachedSummary: TransactionSummary | null = null;
+
+  constructor(app: AppClassProperties, manager: TransactionManager) {
+    this.app = app;
+    this.manager = manager;
+    this.initialAppState = { ...app.store.snapshot.appState };
+    this.manager.registerTransaction(this);
+  }
+
+  get status(): TransactionStatus {
+    return this.manager.getStatus(this.id);
+  }
+
+  private assertActive(action: string): void {
+    const status = this.status;
+    if (status !== "active") {
+      throw new Error(
+        `Cannot ${action} — transaction ${this.id} is already ${status}.`,
+      );
+    }
+  }
+
+  private closeTransaction() {
+    this.manager.detachTransactionInstance(this.id);
+    this.undoOverridePlanner.clear();
+  }
+
+  public collectUndoOverridesForDelta(
+    delta: StoreDelta,
+    reservedConsumedKeys: Set<string>,
+  ): TxUndoOverride[] {
+    if (this.status !== "active") {
+      return [];
+    }
+
+    const candidates =
+      this.undoOverridePlanner.collectCandidatesForDurableDelta(
+        delta,
+        (elementId) => this.ledger.getEntry(elementId),
+        reservedConsumedKeys,
+      );
+
+    if (candidates.length === 0) {
+      return [];
+    }
+
+    const overrides: TxUndoOverride[] = [];
+    for (const candidate of candidates) {
+      this.undoOverridePlanner.markConsumed(candidate.consumedKey);
+      overrides.push({
+        txId: this.id,
+        ...candidate,
+      });
+    }
+
+    return overrides;
+  }
+
+  updateScene<K extends keyof AppState>(data: {
+    elements?: SceneData["elements"];
+    appState?: Pick<AppState, K> | null;
+  }): void {
+    this.assertActive("updateScene");
+
+    // Snapshot before (shallow copy — replaceAllElements mutates the map in-place)
+    const before = shallowCopySceneElements(
+      this.app.scene.getElementsMapIncludingDeleted(),
+    );
+
+    // Apply through the real updateScene with NEVER.
+    this.app.api.updateScene({
+      elements: data.elements,
+      appState: data.appState,
+      captureUpdate: CaptureUpdateAction.NEVER,
+    });
+
+    // Snapshot after
+    const after = this.app.scene.getElementsMapIncludingDeleted();
+
+    this.undoOverridePlanner.recordStep(before, after);
+
+    // Record element diff into ledger
+    this.ledger.recordStep(before, after);
+
+    // Accumulate appState intent
+    if (data.appState) {
+      this.accumulatedAppState = {
+        ...this.accumulatedAppState,
+        ...(data.appState as Record<string, unknown>),
+      };
+    }
+  }
+
+  /**
+   * Partial element updates convenience API.
+   *
+   * Example:
+   * tx.updateElements({
+   *   elements: [
+   *     { id: "a", type: "rectangle", updates: { strokeColor: "#f00" } },
+   *     { id: "b", type: "rectangle", updates: { x: 10, y: 20 } },
+   *   ],
+   * })
+   */
+  updateElements<K extends keyof AppState>(data: {
+    elements: readonly TransactionElementUpdate[];
+    appState?: Pick<AppState, K> | null;
+  }): void {
+    const updatesById = new Map<string, TransactionElementUpdate>();
+
+    for (const update of data.elements) {
+      updatesById.set(update.id, update);
+    }
+
+    if (updatesById.size === 0) {
+      this.updateScene({ appState: data.appState });
+      return;
+    }
+
+    const nextElements = this.app.scene
+      .getElementsIncludingDeleted()
+      .map((element) => {
+        const update = updatesById.get(element.id);
+        if (!update) {
+          return element;
+        }
+        if (element.type !== update.type) {
+          throw new Error(
+            `Cannot apply tx.updateElements update for "${update.id}": expected "${update.type}", got "${element.type}".`,
+          );
+        }
+
+        type MatchingElement = TransactionElementOfType<typeof update.type>;
+        return newElementWith(
+          element as MatchingElement,
+          update.updates as ElementUpdate<MatchingElement>,
+        );
+      });
+
+    this.updateScene({
+      elements: nextElements,
+      appState: data.appState,
+    });
+  }
+
+  commit(options?: CommitOptions): TransactionSummary {
+    if (this.cachedSummary) {
+      return this.cachedSummary;
+    }
+
+    this.manager.markTransactionCommitted(this.id);
+    let historyCommitted = false;
+    try {
+      historyCommitted = this.hasPendingWork()
+        ? this.commitHistoryEntry(options)
+        : false;
+    } finally {
+      this.closeTransaction();
+    }
+
+    const status = this.status;
+    this.cachedSummary = {
+      id: this.id,
+      status,
+      historyCommitted,
+    };
+    this.ledger.clear();
+    return this.cachedSummary;
+  }
+
+  private hasPendingWork() {
+    return this.ledger.hasEntries() || this.hasAccumulatedAppStateIntent();
+  }
+
+  private hasAccumulatedAppStateIntent() {
+    return Object.keys(this.accumulatedAppState).length > 0;
+  }
+
+  private commitHistoryEntry(options?: CommitOptions) {
+    const liveMap = this.app.scene.getElementsMapIncludingDeleted();
+    const { elementsBefore, elementsAfter } =
+      this.ledger.buildSyntheticSnapshots(liveMap);
+
+    const appStateDelta = this.resolveCommitAppStateDelta(options);
+
+    return this.app.store.commitSyntheticIncrement({
+      logicalBefore: { elements: elementsBefore },
+      logicalAfter: {
+        elements: elementsAfter,
+        appState: appStateDelta,
+      },
+    });
+  }
+
+  private resolveCommitAppStateDelta(
+    options?: CommitOptions,
+  ): Partial<ObservedAppState> | undefined {
+    if (!this.hasAccumulatedAppStateIntent()) {
+      return undefined;
+    }
+
+    if (!options?.resolveAppState) {
+      return this.accumulatedAppState as Partial<ObservedAppState>;
+    }
+
+    const context: AppStateResolverContext = {
+      initial: this.initialAppState,
+      accumulated: this.accumulatedAppState as Partial<ObservedAppState>,
+      live: { ...this.app.store.snapshot.appState },
+    };
+    const resolved = options.resolveAppState(context);
+
+    if (!resolved || Object.keys(resolved).length === 0) {
+      return undefined;
+    }
+    return resolved;
+  }
+
+  cancel(): TransactionSummary {
+    if (this.cachedSummary) {
+      return this.cachedSummary;
+    }
+
+    if (this.status === "active") {
+      this.manager.markTransactionCanceled(this.id);
+    }
+
+    this.closeTransaction();
+    const status = this.status;
+    this.cachedSummary = {
+      id: this.id,
+      status,
+      historyCommitted: false,
+    };
+    this.ledger.clear();
+    return this.cachedSummary;
+  }
+}

packages/excalidraw/transaction/types.ts

@@ -0,0 +1,83 @@
+import type { ElementUpdate } from "@excalidraw/element";
+
+import type {
+  ExcalidrawElement,
+  ExcalidrawNonSelectionElement,
+} from "@excalidraw/element/types";
+
+import type { ObservedAppState } from "../types";
+
+export type ElementPropName = Extract<keyof ExcalidrawElement, string>;
+
+export type TouchedElementProps =
+  | { kind: "all" }
+  | { kind: "partial"; props: Set<ElementPropName> };
+
+export type ElementChange = {
+  id: ExcalidrawElement["id"];
+  before: ExcalidrawElement | null;
+  after: ExcalidrawElement | null;
+  touchedProps: TouchedElementProps;
+};
+
+/** Per-element ledger record captured during a transaction session. */
+export type TransactionLedgerEntry = {
+  baselineElement: ExcalidrawElement | null;
+  targetElement: ExcalidrawElement | null;
+  touchedProps: TouchedElementProps;
+};
+
+/** Lifecycle state of a transaction. */
+export type TransactionStatus = "active" | "committed" | "canceled";
+
+/** Per-element partial patch used by tx.updateElements(). */
+export type TransactionUpdatableElementType =
+  ExcalidrawNonSelectionElement["type"];
+
+export type TransactionElementOfType<
+  TType extends TransactionUpdatableElementType,
+> = Extract<ExcalidrawNonSelectionElement, { type: TType }>;
+
+export type TransactionElementUpdate<
+  TType extends TransactionUpdatableElementType = TransactionUpdatableElementType,
+> = TType extends TransactionUpdatableElementType
+  ? {
+      id: ExcalidrawElement["id"];
+      type: TType;
+      updates: ElementUpdate<TransactionElementOfType<TType>>;
+    }
+  : never;
+
+/** Final summary returned when a transaction is committed or canceled. */
+export type TransactionSummary = {
+  id: string;
+  status: TransactionStatus;
+  historyCommitted: boolean;
+};
+
+/** Three-way appState context provided to the resolver at commit time. */
+export type AppStateResolverContext = {
+  /** AppState snapshot captured when the transaction was created. */
+  initial: Partial<ObservedAppState>;
+  /** Merged appState intent from all updateScene calls during the transaction. */
+  accumulated: Partial<ObservedAppState>;
+  /** Current live appState at commit time. */
+  live: Partial<ObservedAppState>;
+};
+
+/**
+ * Caller-provided resolver that determines which appState changes are
+ * recorded in the history entry.
+ *
+ * Unlike elements — where per-property conflict detection works because
+ * element properties are largely independent — appState keys are often
+ * interdependent (e.g. selectedElementIds ↔ selectedGroupIds must stay
+ * consistent). The correct merge strategy therefore depends on the
+ * caller's semantic context, not on a generic policy.
+ *
+ * Return the appState delta to record in history, or undefined to skip
+ * appState changes entirely.
+ */
+export type AppStateResolver = (
+  context: AppStateResolverContext,
+) => Partial<ObservedAppState> | undefined;

packages/excalidraw/transaction/undoOverridePlanner.ts

@@ -0,0 +1,283 @@
+import type { StoreDelta, TxUndoOverride } from "@excalidraw/element";
+
+import type { ExcalidrawElement } from "@excalidraw/element/types";
+
+import {
+  TX_UNDO_OVERRIDE_IGNORED_PROPS,
+  collectElementChanges,
+  getElementProp,
+  getElementPropEntries,
+  getUpdatedElementEntries,
+  hasTouchedProp,
+  isPartialTouchedProps,
+  isLedgerValueEqual,
+  serializeConsumedPropKey,
+  serializeIntermediateValue,
+  touchesWholeElement,
+  type ElementUpdatedEntry,
+} from "./diff";
+
+import type {
+  ElementPropName,
+  TouchedElementProps,
+  TransactionLedgerEntry,
+} from "./types";
+
+type TxUndoOverrideCandidate = Omit<TxUndoOverride, "txId">;
+
+/**
+ * Per-element-prop history of tx intermediate values.
+ *
+ * We keep:
+ * - the full sequence for exact deep-equality fallback
+ * - a serialized signature set for fast negative lookups
+ * - the latest value for the most common positive lookup path
+ */
+class TxIntermediateValueHistory {
+  private readonly values: unknown[] = [];
+  private readonly signatures = new Set<string>();
+  private latestValue: unknown;
+  private hasLatestValue = false;
+
+  /** Appends a new intermediate value, skipping consecutive duplicates. */
+  add(value: unknown) {
+    if (this.hasLatestValue && isLedgerValueEqual(this.latestValue, value)) {
+      return;
+    }
+
+    this.values.push(value);
+    this.signatures.add(serializeIntermediateValue(value));
+    this.latestValue = value;
+    this.hasLatestValue = true;
+  }
+
+  /** Returns whether the candidate appeared in this tx prop history. */
+  contains(candidate: unknown) {
+    const candidateSignature = serializeIntermediateValue(candidate);
+    if (!this.signatures.has(candidateSignature)) {
+      return false;
+    }
+
+    if (
+      this.hasLatestValue &&
+      isLedgerValueEqual(this.latestValue, candidate)
+    ) {
+      return true;
+    }
+
+    return this.values.some((value) => isLedgerValueEqual(value, candidate));
+  }
+}
+
+/**
+ * Tracks tx intermediate values and computes undo baseline override markers
+ * for durable user deltas recorded while tx is active.
+ *
+ * High-level flow:
+ * 1. `recordStep()` observes every in-tx scene mutation and records the
+ *    intermediate value reached by each touched element prop.
+ * 2. When a durable user delta is about to be recorded,
+ *    `collectCandidatesForDurableDelta()` checks whether that delta's
+ *    deleted-baseline values match any tx intermediate value.
+ * 3. If they do, we emit override candidates so undo can restore the pre-tx
+ *    baseline once the tx has ended.
+ * 4. `markConsumed()` ensures only the first polluted durable entry for a
+ *    given element+prop gets patched; later user actions keep their own
+ *    action-local undo baseline.
+ */
+export class TxUndoOverridePlanner {
+  private readonly intermediateValuesByElementProp = new Map<
+    string,
+    Map<ElementPropName, TxIntermediateValueHistory>
+  >();
+  private readonly consumedOverridePropKeys = new Set<string>();
+
+  /** Resets planner state when the transaction finishes. */
+  clear() {
+    this.consumedOverridePropKeys.clear();
+    this.intermediateValuesByElementProp.clear();
+  }
+
+  /** Records per-prop intermediate values reached by one in-tx scene step. */
+  recordStep(
+    before: ReadonlyMap<string, ExcalidrawElement>,
+    after: ReadonlyMap<string, ExcalidrawElement>,
+  ) {
+    for (const change of collectElementChanges(before, after)) {
+      const { id: elementId, after: afterElement, touchedProps } = change;
+
+      if (!afterElement || !isPartialTouchedProps(touchedProps)) {
+        continue;
+      }
+
+      for (const prop of touchedProps.props) {
+        this.recordIntermediateValue(
+          elementId,
+          prop,
+          getElementProp(afterElement, prop),
+        );
+      }
+    }
+  }
+
+  /**
+   * Collects override candidates for one durable user delta recorded while the
+   * tx is active.
+   */
+  collectCandidatesForDurableDelta(
+    delta: StoreDelta,
+    getLedgerEntry: (elementId: string) => TransactionLedgerEntry | undefined,
+    reservedConsumedKeys: Set<string>,
+  ): TxUndoOverrideCandidate[] {
+    const candidates: TxUndoOverrideCandidate[] = [];
+
+    for (const [elementId, deltaEntry] of Object.entries(
+      getUpdatedElementEntries(delta),
+    )) {
+      const ledgerEntry = getLedgerEntry(elementId);
+      if (!ledgerEntry) {
+        continue;
+      }
+
+      const elementCandidates = this.collectCandidatesForElement(
+        elementId,
+        deltaEntry,
+        ledgerEntry,
+        reservedConsumedKeys,
+      );
+      if (elementCandidates.length > 0) {
+        candidates.push(...elementCandidates);
+      }
+    }
+
+    return candidates;
+  }
+
+  /** Evaluates one element's updated entry against the tx ledger snapshot. */
+  private collectCandidatesForElement(
+    elementId: string,
+    deltaEntry: ElementUpdatedEntry,
+    ledgerEntry: TransactionLedgerEntry,
+    reservedConsumedKeys: Set<string>,
+  ): TxUndoOverrideCandidate[] {
+    const { baselineElement, touchedProps } = ledgerEntry;
+    if (!baselineElement || touchesWholeElement(touchedProps)) {
+      return [];
+    }
+
+    const candidates: TxUndoOverrideCandidate[] = [];
+    for (const [prop, deletedValue] of getElementPropEntries(
+      deltaEntry.deleted,
+    )) {
+      const candidate = this.createCandidateForProp({
+        elementId,
+        prop,
+        deletedValue,
+        baselineElement,
+        touchedProps,
+        reservedConsumedKeys,
+      });
+      if (candidate) {
+        candidates.push(candidate);
+      }
+    }
+
+    return candidates;
+  }
+
+  /**
+   * Returns an override candidate for one element+prop when the durable delta's
+   * deleted baseline was polluted by a tx intermediate value.
+   */
+  private createCandidateForProp(args: {
+    elementId: string;
+    prop: ElementPropName;
+    deletedValue: unknown;
+    baselineElement: ExcalidrawElement;
+    touchedProps: TouchedElementProps;
+    reservedConsumedKeys: Set<string>;
+  }): TxUndoOverrideCandidate | null {
+    const { elementId, prop, deletedValue, baselineElement, touchedProps } =
+      args;
+
+    if (
+      TX_UNDO_OVERRIDE_IGNORED_PROPS.has(prop) ||
+      !hasTouchedProp(touchedProps, prop)
+    ) {
+      return null;
+    }
+
+    const consumedPropKey = serializeConsumedPropKey(elementId, prop);
+    // Override only the first polluted user entry for this element+prop.
+    // Later user actions should keep action-local undo baselines.
+    if (
+      this.consumedOverridePropKeys.has(consumedPropKey) ||
+      args.reservedConsumedKeys.has(consumedPropKey)
+    ) {
+      return null;
+    }
+
+    if (!this.matchesIntermediateValue(elementId, prop, deletedValue)) {
+      return null;
+    }
+
+    return {
+      elementId,
+      prop,
+      expectedInsertedValue: deletedValue,
+      preTxBaselineValue: getElementProp(baselineElement, prop),
+      consumedKey: consumedPropKey,
+    };
+  }
+
+  /** Marks an element+prop override as consumed by an earlier durable entry. */
+  markConsumed(consumedPropKey: string) {
+    this.consumedOverridePropKeys.add(consumedPropKey);
+  }
+
+  /** Returns the per-prop history map for one element, creating it if needed. */
+  private getOrCreatePropValues(elementId: string) {
+    const existing = this.intermediateValuesByElementProp.get(elementId);
+    if (existing) {
+      return existing;
+    }
+
+    const created = new Map<ElementPropName, TxIntermediateValueHistory>();
+    this.intermediateValuesByElementProp.set(elementId, created);
+    return created;
+  }
+
+  /** Appends one observed intermediate value for an element prop. */
+  private recordIntermediateValue(
+    elementId: string,
+    prop: ElementPropName,
+    value: unknown,
+  ) {
+    const propValues = this.getOrCreatePropValues(elementId);
+    const history = propValues.get(prop);
+    if (history) {
+      history.add(value);
+      return;
+    }
+
+    const nextHistory = new TxIntermediateValueHistory();
+    nextHistory.add(value);
+    propValues.set(prop, nextHistory);
+  }
+
+  /** Checks whether a durable delta baseline matches any tx intermediate value. */
+  private matchesIntermediateValue(
+    elementId: string,
+    prop: ElementPropName,
+    candidate: unknown,
+  ) {
+    const history = this.intermediateValuesByElementProp
+      .get(elementId)
+      ?.get(prop);
+    if (!history) {
+      return false;
+    }
+
+    return history.contains(candidate);
+  }
+}

packages/excalidraw/types.ts

@@ -269,6 +269,8 @@ export type ObservedElementsAppState = {
   activeLockedId: AppState["activeLockedId"];
 };
 
+export type BoxSelectionMode = "contain" | "overlap";
+
 export interface AppState {
   contextMenu: {
     items: ContextMenuItems;
@@ -307,6 +309,8 @@ export interface AppState {
    * `bindingPreference` and keyboard modifiers (ctrl/alt)
    */
   isBindingEnabled: boolean;
+  /** user box selection preference; defaults to "contain" when unset */
+  boxSelectionMode: BoxSelectionMode;
   /** user arrow binding preference */
   bindingPreference: "enabled" | "disabled";
   /** user preference whether arrow snap to midpoints while binding */
@@ -792,6 +796,9 @@ export type AppClassProperties = {
   files: BinaryFiles;
   editorInterface: App["editorInterface"];
   scene: App["scene"];
+  store: App["store"];
+  transactionManager: App["transactionManager"];
+  createTransaction: App["createTransaction"];
   syncActionResult: App["syncActionResult"];
   fonts: App["fonts"];
   pasteFromClipboard: App["pasteFromClipboard"];

packages/math/src/curve.ts

@@ -137,8 +137,17 @@ const calculate = <Point extends GlobalPoint | LocalPoint>(
   [t0, s0]: [number, number],
   l: LineSegment<Point>,
   c: Curve<Point>,
+  tolerance: number = 1e-2,
+  iterLimit: number = 4,
 ) => {
-  const solution = solveWithAnalyticalJacobian(c, l, t0, s0, 1e-2, 4);
+  const solution = solveWithAnalyticalJacobian(
+    c,
+    l,
+    t0,
+    s0,
+    tolerance,
+    iterLimit,
+  );
 
   if (!solution) {
     return null;
@@ -158,18 +167,43 @@ const calculate = <Point extends GlobalPoint | LocalPoint>(
  */
 export function curveIntersectLineSegment<
   Point extends GlobalPoint | LocalPoint,
->(c: Curve<Point>, l: LineSegment<Point>): Point[] {
+>(
-  let solution = calculate(initial_guesses[0], l, c);
+  c: Curve<Point>,
+  l: LineSegment<Point>,
+  opts?: {
+    tolerance?: number;
+    iterLimit?: number;
+  },
+): Point[] {
+  let solution = calculate(
+    initial_guesses[0],
+    l,
+    c,
+    opts?.tolerance,
+    opts?.iterLimit,
+  );
   if (solution) {
     return [solution];
   }
 
-  solution = calculate(initial_guesses[1], l, c);
+  solution = calculate(
+    initial_guesses[1],
+    l,
+    c,
+    opts?.tolerance,
+    opts?.iterLimit,
+  );
   if (solution) {
     return [solution];
   }
 
-  solution = calculate(initial_guesses[2], l, c);
+  solution = calculate(
+    initial_guesses[2],
+    l,
+    c,
+    opts?.tolerance,
+    opts?.iterLimit,
+  );
   if (solution) {
     return [solution];
   }

packages/utils/tests/__snapshots__/export.test.ts.snap

@@ -13,6 +13,7 @@ exports[`exportToSvg > with default arguments 1`] = `
   },
   "bindMode": "orbit",
   "bindingPreference": "enabled",
+  "boxSelectionMode": "contain",
   "collaborators": Map {},
   "contextMenu": null,
   "croppingElementId": null,

scripts/woff2/woff2-vite-plugins.js

@@ -90,6 +90,13 @@ module.exports.woff2BrowserPlugin = () => {
         type="font/woff2"
         crossorigin="anonymous"
       />
+      <link
+        rel="preload"
+        href="${OSS_FONTS_CDN}fonts/Assistant/Assistant-SemiBold.woff2"
+        as="font"
+        type="font/woff2"
+        crossorigin="anonymous"
+      />
       <link
         rel="preload"
         href="${OSS_FONTS_CDN}fonts/ComicShanns/ComicShanns-Regular-279a7b317d12eb88de06167bd672b4b4.woff2"