Viewport change events causing out of memory error

[BeksOmega]

Describe the bug

If you jiggle the workspace too much, it can cause the tab to crash with an out of memory error.

To Reproduce

Steps to reproduce the behavior:

1. Go to the advanced playground
2. Open up the console so that the browser will pause before crashing.
3. Jiggle the workspace around rapidly.
4. Observe how after a few seconds the browser will pause with a warning that it is about to run out of memory.

Expected behavior

No crashes. Not sure how to achieve that though.

Desktop (please complete the following information):

• OS: Ubuntu 18.04
• Browser: Chrome
• Version: 91

Stack Traces

Here is the stack trace I get when it pauses:

e.getLineFeedCnt (pieceTreeBase.ts:928)
e.createNewPieces (pieceTreeBase.ts:1047)
e.insert (pieceTreeBase.ts:740)
e._doApplyEdits (pieceTreeTextBuffer.ts:412)
e.applyEdits (pieceTreeTextBuffer.ts:275)
o._applyEdits (textModel.ts:1147)
o.applyEdits (textModel.ts:1134)
e.pushEditOperation (editStack.ts:168)
o._pushEditOperations (textModel.ts:1127)
o.pushEditOperations (textModel.ts:1036)
generate (index.js:169)
S (index.js:226)
(anonymous) (index.js:335)
Blockly.Workspace.fireChangeListener (workspace.js:670)
Blockly.Events.fireNow_ (events.js:262)
--- setTimeout (async) ---
Blockly.Events.fire (events.js:244)
Blockly.WorkspaceSvg.maybeFireViewportChangeEvent (workspace_svg.js:1260)
Blockly.WorkspaceSvg.translate (workspace_svg.js:1288)
Blockly.WorkspaceSvg.scroll (workspace_svg.js:2312)
Blockly.WorkspaceDragger.drag (workspace_dragger.js:102)
Blockly.Gesture.handleMove (gesture.js:539)
Blockly.TouchGesture.handleMove (touch_gesture.js:169)
wrapFunc (browser_events.js:64)

[moniika]

Possibly related to RaspberryPiFoundation/blockly-samples#750

[moniika]

Closing for now because unable to repro.