perf(studio): follow playhead across virtualized rows#2701
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miguel-heygen wants to merge 1 commit into
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perf(studio): follow playhead across virtualized rows#2701miguel-heygen wants to merge 1 commit into
miguel-heygen wants to merge 1 commit into
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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
Add smooth playhead following and bounded virtual timeline rows while preserving logical focus and total scroll geometry.
Why
Large projects must not mount every track, but playback still needs to follow the playhead smoothly and selection/focus must continue to address rows outside the mounted window.
How
This is D6 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 #2638, which remains open for audit until landing.
Test plan
Validated on the exact Family D tip with Timeline, editing, virtualization, focus-identity, and virtual-row tests; the full Studio/Server suites; both typechecks; static gates; and two strict 50,000-element Chromium passes with only 9 rows mounted.