@remotion/studio: Avoid re-registering timeline keybindings on selection change

[JonnyBurger]

Summary

Avoids re-registering the timeline Backspace (delete) and Cmd/Ctrl+A (select-all) keybinding handlers every time the timeline selection changes.

Previously, TimelineDeleteKeybindings and TimelineSelectAllKeybindings depended on selectedItems / selectableSequenceSelections / selectItems / clearSelection in their useEffects, which caused the keybindings to be unregistered and re-registered on every selection mutation.

The latest selection state is now read through a new useCurrentTimelineSelectionStateAsRef hook, which exposes the up-to-date context value via a ref. The effects no longer depend on the changing selection, so the keybindings are registered once and stay registered while the provider is mounted.

Test plan

• Select timeline items and press Backspace — items still get deleted
• Press Cmd/Ctrl+A in the timeline — all selectable items get selected
• Verify keybindings still work after repeatedly changing the selection

[vercel]

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview, Comment	May 30, 2026 10:04am
remotion	Ready	Preview, Comment	May 30, 2026 10:04am

[pullfrog]

✅ No new issues found.

Reviewed changes — avoids re-registering timeline Backspace and Cmd/Ctrl+A keybindings on every selection change by reading mutable selection state through a ref instead of depending on it in useEffect.

• TimelineDeleteKeybindings — removes selectedItems / clearSelection from useEffect deps; reads latest selection via currentSelection.current inside the keybinding callback.
• TimelineSelectAllKeybindings — removes selectableSequenceSelections / selectItems from useEffect deps; reads latest selections via ref.
• TimelineSelectionProvider — wraps children in a new CurrentTimelineSelectionContext that exposes the full context value as a ref, paired with a new useCurrentTimelineSelectionStateAsRef consumer hook.

Clean, focused perf improvement with no behavioral change.

  ^{｜ View workflow run ｜ Using Kimi K2 ｜ 𝕏}