perf(studio): stabilize virtualized clip gestures#2704
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This was referenced Jul 21, 2026
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What
Stabilize clip move and resize gestures when timeline rows and clips are virtualized.
Why
Virtualization can unmount or recycle the surface that started a gesture. The gesture must keep one explicit session owner so preview, autoscroll, cancellation, and commit cannot drift or double-fire as the viewport changes.
How
This is E1 of the independent Family E draft Graphite stack. Its review base is the immutable, PR-less Family D baseline; Families A-D do not need to merge for this PR to be reviewed.
Test plan
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.