feat: improve zoom-to-content when creating flowchart (#8368)

packages/excalidraw/element/bounds.ts

@@ -738,6 +738,7 @@ export const getElementBounds = (
 
 export const getCommonBounds = (
   elements: readonly ExcalidrawElement[],
+  elementsMap?: ElementsMap,
 ): Bounds => {
   if (!elements.length) {
     return [0, 0, 0, 0];
@@ -748,10 +749,11 @@ export const getCommonBounds = (
   let minY = Infinity;
   let maxY = -Infinity;
 
-  const elementsMap = arrayToMap(elements);
-
   elements.forEach((element) => {
-    const [x1, y1, x2, y2] = getElementBounds(element, elementsMap);
+    const [x1, y1, x2, y2] = getElementBounds(
+      element,
+      elementsMap || arrayToMap(elements),
+    );
     minX = Math.min(minX, x1);
     minY = Math.min(minY, y1);
     maxX = Math.max(maxX, x2);