perf(studio): index timeline clip windows#2702
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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
Index clip intervals per displayed track so visible clip windows do not scan the complete project.
Why
Row virtualization alone still leaves horizontal rendering proportional to every clip. Large timelines need interval queries whose work is bounded by the visible time range plus explicitly pinned actors.
How
This is D7 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 #2639, which remains open for audit until landing.
Test plan
Validated on the exact Family D tip with clip-index and layout coverage, the full Studio/Server suites, both typechecks, static gates, and two strict 50,000-element Chromium passes.