VPS-219: Fix crash when undoing multi-object deletion by rgin216 · Pull Request #545 · UoaWDCC/VPS

rgin216 · 2026-09-24T00:04:04Z

Issue

VPS-219: Deleting multiple selected objects and pressing Ctrl+Z can crash the authoring tool with "Something went wrong". Selection renderers can access missing components or cleared bounds while the scene and editor stores update.

Solution

Batch history-driven scene and selection updates in React 17 so undo/redo restoration completes before rendering.
Hide selection handles while any selected component is missing, and guard the rotation handle against cleared bounds.

Risk

Changes affect shared selection rendering and undo/redo. Full keyboard-flow verification in a signed-in browser remains outstanding.

Validation

Both existing frontend tests pass; this PR adds no tests or test configuration changes.
ESLint passes for the four changed files.
Production build passes with a bundle-size warning.

Checklist

Acceptance criteria met (browser verification pending)
Wiki documentation is written and up to date (no documentation changes)
Unit tests written and passing (existing tests pass; no new tests)
Integration tests written and passing
Continuous integration build passing

Summary by CodeRabbit

Bug Fixes
- Improved undo and redo consistency for scene changes, selection restoration, text cursor placement, and saving.
- Prevented selection overlays and rotation handles from appearing or failing when selected components are unavailable.
- Improved bounds handling for selections with missing components, including during component dragging.

…sions

vercel · 2026-09-24T00:04:10Z

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Project	Deployment	Actions	Updated
vps	Ready	Preview	Oct 13, 2026 10:07pm UTC

linear · 2026-09-24T00:04:15Z

VPS-219

coderabbitai · 2026-09-24T00:04:17Z

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📒 Files selected for processing: 1

frontend/src/features/authoring/handlers/pointer/pointer.ts

🚧 Files skipped from review as they are similar to previous changes: 1

frontend/src/features/authoring/handlers/pointer/pointer.ts

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📝 Walkthrough

The authoring history listener now batches undo and redo restoration with saving updates. Selection bounds and rendering now account for selected component IDs that do not resolve in the visual scene.

Changes: Authoring history and selection safeguards

Layer / File(s)	Summary
Batch history updates `frontend/src/features/authoring/AuthoringToolPage.jsx`	The history listener runs restoration, saving-state updates, and the debounced save call inside one `unstable_batchedUpdates` callback.
Guard selection bounds and rendering `frontend/src/features/authoring/handlers/pointer/pointer.ts`, `frontend/src/features/authoring/canvas/Overlay.tsx`, `frontend/src/features/authoring/canvas/handles/RotationHandle.tsx`	Selected bounds return `null` if any selected component is missing. The overlay requires all selected IDs to resolve, and the rotation handle returns `null` when bounds are unavailable.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to ca924

The change guards history undo and redo and the selection handling against missing components, which addresses the reported crash. No remaining merge-blocking risk is evident. A manual check of the keyboard undo flow in a signed-in browser is still outstanding.

Security architecture risk: 🔵 Low · up to 15bb9

The change appears limited to the authoring editor and reduces crashes during undo and redo. No new access path or permission change was identified, but interrupted saves and rapid editing flows have not been fully verified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

inferred — The changed path is an authoring-session history and rendering flow. It uses the existing scene-context persistence path; the inspected changes do not expand it to a new service or privileged sink.

Trust Boundaries and Controls

inferred — Undo and redo use existing history records and scene-context calls; no changed identity input, authorization decision, API route, or direct persistence call was identified in the listener. Backend enforcement was not assessed.

Resilience and Maintainability Implications

observed — The pre-existing switch-save failure path can discard outgoing changes. The inspected batching change does not demonstrate a new security exposure from that failure mode.

Hardening Proposals

proposed — For the existing persistence path, consider version-checking or serializing per-scene saves and retaining outgoing state until a switch-triggered save succeeds, so failure or request reordering cannot silently replace newer work.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 16.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 5 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly identifies the main change: fixing a crash when undoing deletion of multiple objects.
Description check		The description includes the required Issue, Solution, Risk, and Checklist sections. It also documents validation results and identifies outstanding browser verification and unchecked test items.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

🪄 Fix CodeRabbit comments on this PR

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Inline comments:
In `@frontend/src/features/authoring/scene/history.test.js`:
- Around line 82-116: Update the history test to exercise the production
listener and its unstable_batchedUpdates path instead of restoring scene state
and selection through the local apply callback. Mount AuthoringToolPage or
extract and test its history callback as a shared unit, while retaining the
repeated undo/redo and snapshot assertions.

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📒 Files selected for processing (6)

frontend/package.json
frontend/src/features/authoring/AuthoringToolPage.jsx
frontend/src/features/authoring/canvas/Overlay.tsx
frontend/src/features/authoring/canvas/handles/RotationHandle.tsx
frontend/src/features/authoring/handlers/pointer/pointer.ts
frontend/src/features/authoring/scene/history.test.js

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rgin216 · 2026-09-24T00:23:22Z

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coderabbitai · 2026-09-24T00:23:29Z

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rgin216 · 2026-09-25T23:28:17Z

@coderabbitai full review

coderabbitai · 2026-09-25T23:28:26Z

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rgin216 · 2026-10-07T04:28:31Z

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coderabbitai · 2026-10-07T04:28:39Z

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Actionable comments posted: 1

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Inline comments:
Review comments at @frontend/src/features/authoring/handlers/pointer/pointer.ts:
- Line 310: Update handleComponentDrag to return when
getSelectedComponentBounds() yields null before accessing bounds.verts; preserve
the existing behavior for valid bounds.

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📒 Files selected for processing (4)

frontend/src/features/authoring/AuthoringToolPage.jsx
frontend/src/features/authoring/canvas/Overlay.tsx
frontend/src/features/authoring/canvas/handles/RotationHandle.tsx
frontend/src/features/authoring/handlers/pointer/pointer.ts

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harbassan

lgtm

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Inline comments:
Review comments at @frontend/src/features/authoring/handlers/pointer/pointer.ts:
- Around line 157-158: Update handleMutationEnd so the multi-selection path
handles unavailable selection bounds before reading verts: restore normal mode,
clear active guides, and return when getSelectedComponentBounds() yields no
bounds; otherwise continue using the returned bounds.

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frontend/src/features/authoring/AuthoringToolPage.jsx
frontend/src/features/authoring/handlers/pointer/pointer.ts

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frontend/src/features/authoring/AuthoringToolPage.jsx

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rgin216 added 2 commits September 23, 2026 23:23

VPS-219: batch undo restoration and guard stale selection handles

3f63dc1

VPS-219: cover multi-object deletion undo and selection render regres…

211e6bd

…sions

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rgin216 requested review from harbassan and hazikchaudhry September 24, 2026 00:04

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Comment thread frontend/src/features/authoring/scene/history.test.js Outdated

VPS-219: test undo through the shared production history listener

f3c617a

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VPS-219: remove added tests and test-only listener extraction

15bb9eb

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coderabbitai Bot approved these changes Sep 25, 2026

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K1mmyn self-requested a review September 29, 2026 21:56

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Merge branch 'master' into VPS-219/fix/CtrlZMultipleObject

e633cfd

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Comment thread frontend/src/features/authoring/handlers/pointer/pointer.ts

VPS-219: guard component dragging against missing bounds

a5f1535

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harbassan approved these changes Oct 9, 2026

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Pushing a useless commit to restart vercel deployment

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Comment thread frontend/src/features/authoring/handlers/pointer/pointer.ts

VPS-219: handle missing bounds when ending mutations

ca92453

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Merge branch 'master' into VPS-219/fix/CtrlZMultipleObject

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rgin216 merged commit b6cdaec into master Oct 14, 2026
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rgin216 deleted the VPS-219/fix/CtrlZMultipleObject branch October 14, 2026 00:37

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