perf(studio): virtualize timeline marquee selection#2707
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This was referenced Jul 21, 2026
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This was referenced Jul 21, 2026
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What
Virtualize timeline marquee selection without changing its logical selection semantics.
Why
Marquee selection must include eligible off-window rows and clips even though only a bounded DOM subset is mounted. DOM-only hit testing would silently miss elements as projects grow.
How
This is E4 of the independent Family E draft Graphite stack, stacked only on E1-E3 and the immutable Family D review baseline.
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.