* test(diff): repro for STA-3420 combined-diff invalidation freeze
Co-authored-by: Orca <help@stably.ai>
* Fix diff-view freeze when large diff invalidated by rebase writes
Staged-diff sections now reload in-place on external file changes instead of remounting every visible Monaco editor and bumping the virtualizer generation, which wedged the renderer during rebase bursts.
* test(diff): calibrate STA-3420 burst assertions against an idle baseline
The burst window's peak lag is dominated by a one-off stall from opening 8x15k-line
Monaco editors, which reproduces identically with invalidation disabled. Measure an
equal-length idle window first and assert p95, sample coverage, and lag relative to
that floor. Adds unit coverage for isUnchangedDiffSectionReload.
Co-authored-by: Orca <help@stably.ai>
* fix(diff): keep renderedIndicesRef pure during render
React Doctor blocks ref mutation during render; sync the on-screen
section set in a layout effect instead so static analysis can pass.
* Fix unchanged diff-section reload detection for truncated diffs
When a diff exceeds render limits, content is pruned to '' for memory.
The old check compared content equality, so limited reloads always
appeared changed, triggering unnecessary revalidation that froze the UI.
Compare render-limit metadata instead — it's the sole change signal
and full description of what the fallback banner displays.
Also calibrate STA-3420 e2e assertions relative to idle baseline for
machine independence instead of absolute thresholds.
* fix(diff): defer invalidation reloads for in-flight stale-token loads
When a diff section is invalidated while a large-diff load is in-flight:
- Don't delete the in-flight load from loadingIndicesRef, since a newer load may own it
- Bump the reload token but defer the reload if there's still an in-flight load
- Let the in-flight load settle first, then reschedule the reload at settle-time
- Prevents the freeze by avoiding race conditions that leave sections stuck loading
This fixes STA-3420 where rebase-driven invalidations could hang the diff view.
* test(diff): relax STA-3420 burst assertions to inclusive comparisons
Switch from strict inequality checks (toBeLessThan, toBeGreaterThan) to
inclusive variants (toBeLessThanOrEqual, toBeGreaterThanOrEqual) to allow
measurements landing exactly on the threshold boundaries.
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Co-authored-by: Orca <help@stably.ai>
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