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fix(virtual-core): reconcile index scrolls after pending measurements - #1294
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Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 5 remain after this review. 📝 WalkthroughWalkthroughThe virtualizer tracks when a scroll reaches its target and continues index-based reconciliation while measurements are pending. Tests cover deferred ResizeObserver delivery, external scrolls, and end-clamp adjustments. The cached-measurements demo and Playwright test exercise end pinning with both observer scheduling modes. ChangesScroll reconciliation
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Virtualizer
participant ScrollElement
participant ResizeObserver
Virtualizer->>ScrollElement: Issue index-based scroll
ScrollElement->>Virtualizer: Report scroll offset
ResizeObserver->>Virtualizer: Deliver changed measurement
Virtualizer->>ScrollElement: Retarget scroll
ScrollElement->>Virtualizer: Report target offset
Suggested reviewers:
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| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title clearly and concisely describes the main change: reconciling index-based scrolls after pending measurements. |
| Description check | |
The description explains the motivation, implementation behavior, tests, validation results, checklist status, and release impact. It includes the required sections and a changeset. |
| Linked Issues check | |
The PR meets the coding requirements in [#1290]. ScrollState keeps index-scroll reconciliation active for pending ResizeObserver measurements, including animation-frame-deferred measurements. It can… |
| Out of Scope Changes check | |
The changes stay within [#1290]. The implementation changes index-scroll reconciliation. The core tests, browser regression, demo controls, and changeset directly support the fix. No unrelated change … |
| Docstring Coverage | |
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 4… |
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packages/virtual-core/tests/index.test.ts
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🦋 Changeset detectedLatest commit: 610f88b The changes in this PR will be included in the next version bump. This PR includes changesets to release 9 packages
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @packages/virtual-core/src/index.ts:
- Around line 931-948: Reset scrollState.hasReachedTarget when targetChanged in
the scroll reconciliation flow so events from a superseded smooth scroll cannot
cancel reconciliation for the new target; add a regression test that retargets a
smooth scroll and then reports an intermediate offset.
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📒 Files selected for processing (1)
packages/virtual-core/src/index.ts
Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 6 remain after this review.
…reconcile target - scrollToEnd (TanStack#1276, merged in from main) built a ScrollState without hasReachedTarget, which broke the build. - The scroll-away check now uses the same target as reconcileScroll, so a browser clamp to the new max with paddingEnd doesn't cancel scrollToEnd. - A smooth retarget clears hasReachedTarget, so its intermediate scroll events don't cancel reconciliation (CodeRabbit finding). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Pushed a follow-up commit. Merging
Both have regression tests. |
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🎯 Changes
Fixes #1290. Keep
scrollToIndexreconciliation active long enough for pending ResizeObserver measurements to update the target, including rAF-deferred measurements. If an external scroll leaves a reached target during that wait, retire reconciliation so it respects the new position; measurement compensation still reconciles.Added core and browser regressions for a cached row growing while re-pinning to the end, plus coverage for scrolling away and regular/clamped measurement compensation. Both observer modes previously stopped 30px short and now land at the end.
Validation passed:
pnpm test:pr --base=origin/main --parallel=1(69 affected projects), pluspnpm --filter @tanstack/react-virtual test:e2e cached-measurements.spec.ts --browser=all --workers=1(9 tests across Chromium, Firefox, and WebKit). The core suite passes 173 tests, and the existing Marko chat reading/prepend cases also pass five consecutive runs each.✅ Checklist
pnpm run test:pr.🚀 Release Impact
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