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perf(studio): stabilize virtualized beat gestures#2709

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perf(studio): stabilize virtualized beat gestures#2709
miguel-heygen wants to merge 1 commit into
codex/studio-timeline-e-context-targets-v2from
codex/studio-timeline-e-beat-gestures-v2

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@miguel-heygen

@miguel-heygen miguel-heygen commented Jul 21, 2026

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What

Stabilize beat-marker gestures over virtualized timeline content.

Why

Beat dragging and selection must not depend on a marker remaining mounted. Virtualization, autoscroll, and interrupted pointer sequences otherwise risk stale previews or duplicate commits.

How

  • Give beat gestures one explicit lifecycle and commit owner.
  • Preserve logical beat identity through viewport changes and autoscroll.
  • Cover cancellation, cleanup, and virtualized marker behavior with focused tests.

This is E6 of the independent Family E draft Graphite stack, stacked only on E1-E5 and the immutable Family D review baseline.

Test plan

  • Unit tests added/updated
  • Manual testing performed
  • Documentation updated (not applicable)

Validated on the exact Family E tip with 130 focused interaction tests, 3 timeline virtualization tests, the full Studio suite (2,991 passed; 18 todos), Studio typecheck/build, the full workspace build, oxfmt, oxlint, diff hygiene, and file-size/Fallow gates.

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