feat: Don't add midpoint until dragged beyond a threshold (#5927)

* Don't add midpoint until dragged beyond a threshold

* remove unnecessary code

* fix tests

* fix

* add spec

* remove isMidpoint

* cleanup

* fix threshold for zoom

* split into shouldAddMidpoint and addMidpoint

* wrap in flushSync for synchronous updates

* remove threshold for line editor and add spec

* [unrelated] fix stack overflow state update

* fix tests

* don't drag arrow when dragging to add mid point

* add specs

Co-authored-by: dwelle <luzar.david@gmail.com>

src/tests/__snapshots__/regressionTests.test.tsx.snap

@@ -10989,7 +10989,13 @@ Object {
     "lastUncommittedPoint": null,
     "pointerDownState": Object {
       "lastClickedPoint": -1,
+      "origin": null,
       "prevSelectedPointsIndices": null,
+      "segmentMidpoint": Object {
+        "added": false,
+        "index": null,
+        "value": null,
+      },
     },
     "pointerOffset": Object {
       "x": 0,
@@ -11216,7 +11222,13 @@ Object {
     "lastUncommittedPoint": null,
     "pointerDownState": Object {
       "lastClickedPoint": -1,
+      "origin": null,
       "prevSelectedPointsIndices": null,
+      "segmentMidpoint": Object {
+        "added": false,
+        "index": null,
+        "value": null,
+      },
     },
     "pointerOffset": Object {
       "x": 0,
@@ -11671,7 +11683,13 @@ Object {
     "lastUncommittedPoint": null,
     "pointerDownState": Object {
       "lastClickedPoint": -1,
+      "origin": null,
       "prevSelectedPointsIndices": null,
+      "segmentMidpoint": Object {
+        "added": false,
+        "index": null,
+        "value": null,
+      },
     },
     "pointerOffset": Object {
       "x": 0,
@@ -12078,7 +12096,13 @@ Object {
     "lastUncommittedPoint": null,
     "pointerDownState": Object {
       "lastClickedPoint": -1,
+      "origin": null,
       "prevSelectedPointsIndices": null,
+      "segmentMidpoint": Object {
+        "added": false,
+        "index": null,
+        "value": null,
+      },
     },
     "pointerOffset": Object {
       "x": 0,

src/tests/__snapshots__/selection.test.tsx.snap

@@ -21,10 +21,6 @@ Object {
       0,
       0,
     ],
-    Array [
-      15,
-      25,
-    ],
     Array [
       30,
       50,
@@ -40,8 +36,8 @@ Object {
   "strokeWidth": 1,
   "type": "arrow",
   "updated": 1,
-  "version": 4,
-  "versionNonce": 453191,
+  "version": 3,
+  "versionNonce": 449462985,
   "width": 30,
   "x": 10,
   "y": 10,
@@ -69,10 +65,6 @@ Object {
       0,
       0,
     ],
-    Array [
-      15,
-      25,
-    ],
     Array [
       30,
       50,
@@ -88,8 +80,8 @@ Object {
   "strokeWidth": 1,
   "type": "line",
   "updated": 1,
-  "version": 4,
-  "versionNonce": 453191,
+  "version": 3,
+  "versionNonce": 449462985,
   "width": 30,
   "x": 10,
   "y": 10,