[teamleaderleo]

Problem

VirtualTranscript repainted every mounted text node for Find in Chat on every commit, including scroll and layout commits that did not change query, transcript rows, or mounted DOM.

Change

• derive a primitive mounted-range signature from the virtualization windows
• rerun highlighting when the query/active target, immutable row snapshot, or mounted range changes
• preserve streaming/reveal updates and clear behavior when Find closes

This avoids redundant DOM tree walks while keeping highlights correct as rows stream or virtualized rows enter the viewport.

Validation

• git diff --check
• Fleet CI: web checks, React Doctor, compiler/typecheck, focused chat-find tests, and gallery/render guards

---

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---

Summary by cubic

Gates Find in Chat highlight repaints on transcript changes so scrolling and layout commits no longer walk every mounted text node.

Highlighting reruns only when the query, active target, immutable row snapshot, or mounted range changes. Streamed text, fold reveals, and clear-on-close behavior are preserved; the effect keeps revealed as a dependency so opening a fold repaints the match. Effect dependencies use primitive signatures (row id, occurrence, mounted-range key) so spurious state changes don't invalidate the highlight pass.

Validation:

• git diff --check
• Fleet CI: web checks, React Doctor, compiler/typecheck, focused chat-find tests, and gallery/render guards, including the apps empty-state selector carried through this change.

^{Written for commit 3f21ea0. Summary will update on new commits.}

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[teamleaderleo]

Bead cx-l0csy created for this PR by the cmux coordinator.

[github-actions]

all web/size checks green

[github-actions]

Passes: CI passes on 3f21ea0afe.

CI passes on 3f21ea0afe (run 39093237708 attempt 1).

Written by scripts/ci/classify_failures.py (ci-failure-attribution.yml); signatures are its SIGNATURES table. A machine verdict is the runner's fault, not this PR's; yours means the failing file is one this PR changes, also red on main that main's latest full suite fails the same way, seen on other PRs that it failed on another pull request's run lately.

[github-actions]

CI fast guards passes on 3f21ea0afe (https://github.com/manaflow-ai/cmux/actions/runs/39093237708). This covers only the fast guards, not CI: CI's result is the ci-status check, and the CI failure attribution comment names any failing test.

[blacksmith-sh]

Found 2 test failures on Blacksmith runners:

Failures

Test	View Logs
test/apps-flow.test.ts/apps-flow.test	View Logs
test/apps-flow.test.ts/apps-flow.test	View Logs

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[github-actions]

Visual review: HQ feed · workflow run

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/39095141726 at afec4de failed: cmux-next Release compile (Xcode 26).
Those jobs last passed at fde94c5. This pull request is one of 3 merged since: #21383, #21446, #21384.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/39095228117 at 9e14d7a failed: cmux-next Release compile (Xcode 26).
Those jobs last passed at fde94c5. This pull request is one of 3 merged since: #21383, #21446, #21384.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/39096093835 at b246059 failed: cmux app scheme compile (Debug), cmux-next Release compile (Xcode 26).
Those jobs last passed at fde94c5. This pull request is one of 5 merged since: #21383, #21446, #21384, #21450, #21442.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.