perf(studio): virtualize timeline clip windows#2703
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This was referenced Jul 21, 2026
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What
Render only visible clip roots and defer horizontal reveal until virtual scroll geometry is ready.
Why
The final scalability boundary must bound clips as well as rows without hiding selected or active clips, losing reveal requests, shifting ticks, or allowing an early reveal to use stale scroll geometry.
How
This is D8 of the independent Family D draft Graphite stack. Its review base is the immutable, PR-less Family C baseline; Families A-C do not need to merge for this PR to be reviewed. It supersedes legacy PR #2640, which remains open for audit until landing. The unpublished local scroll-deferral source was folded here because the combined diff is 971 changed lines and both changes own the same lifecycle boundary.
Test plan
Validated on the exact Family D tip with virtualization, active-clip, reveal, and player-seek coverage; the full Studio suite (2,939 passed; 18 todos); Studio Server files tests (67 passed); both typechecks; formatting/lint/file-size/Fallow gates; and two consecutive strict 50,000-element Chromium passes bounded to 207 mounted clip roots.