fix(core): ignore synthetic mousemove events without coordinates in side menu

[himself65]

Problem

The side menu registers a document-level capture mousemove listener (SideMenuView.onMouseMove) that stores event.clientX/event.clientY verbatim. A synthetic mousemove created via new Event("mousemove") — e.g. dispatched by a browser extension — is a plain Event with no coordinate properties, so this.mousePos ends up as { x: undefined, y: undefined }. The coordinates then flow through Math.max(..., undefined) → NaN into document.elementsFromPoint(), which throws:

TypeError: Failed to execute 'elementsFromPoint' on 'Document': The provided double value is non-finite.

Stack (from a production Sentry report, @blocknote/core 0.51.4, Chrome 150):

SideMenu.ts getBlockFromCoords → view.root.elementsFromPoint(coords.left, coords.top)
SideMenu.ts getBlockFromMousePos
SideMenu.ts updateStateFromMousePos
SideMenu.ts onMouseMove

Note this also crashes read-only editors: the editor.isEditable check in updateStateFromMousePos runs only after the coordinate lookup.

Fix

Early-return in onMouseMove when clientX/clientY are not finite numbers. Since this.mousePos can then never hold non-finite values, the deferred updateStateFromMousePos() call sites (scroll / doc update) are covered as well.

Testing

• pnpm lint and tsgo --noEmit in packages/core — clean
• pnpm test in packages/core — 458 passed, 3 skipped

Summary by CodeRabbit

• Bug Fixes
  • Improved side menu stability by safely ignoring invalid or incomplete mouse movement events.
  • Prevented unnecessary editor hit-testing and state updates when pointer coordinates are unavailable.

[vercel]

@himself65 is attempting to deploy a commit to the TypeCell Team on Vercel.

A member of the Team first needs to authorize it.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b5ee0406-2773-407a-b8f4-a427644059b9

📥 Commits

Reviewing files that changed from the base of the PR and between 4e9e785 and 88e8895.

📒 Files selected for processing (1)

• packages/core/src/extensions/SideMenu/SideMenu.ts

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📝 Walkthrough

Walkthrough

SideMenuView.onMouseMove now ignores synthetic or otherwise invalid mousemove events whose client coordinates are not finite, preventing downstream hit-testing from throwing.

Changes

Side menu event validation

Layer / File(s)	Summary
Guard invalid mouse coordinates packages/core/src/extensions/SideMenu/SideMenu.ts	onMouseMove returns early when clientX or clientY is not finite, before hit-testing and side menu state updates.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Suggested reviewers: yousefed

Poem

A bunny hops past coordinates unclear,
“No point to inspect when the numbers aren’t here!”
The side menu pauses, safe and spry,
While valid mouse moves go hopping by.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change in the side menu mousemove handling.
Description check	✅ Passed	The description includes the problem, fix, and testing details, covering the main required PR information.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[nperez0111]

Thanks @himself65