[Visual Regression Tests] Stabilize screenshot capture for animated controls#571
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Anna Malchow-Perryman (apman) merged 1 commit intoJun 30, 2026
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…ontrols Use adaptive frame settling in CaptureAndCompare to wait until two consecutive frames are identical (with a bounded timeout) before saving screenshots. This preserves control transitions while reducing nondeterministic visual diffs. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Anna Malchow-Perryman (apman)
June 30, 2026 02:05
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Pull request overview
This PR improves the determinism of Avalonia headless visual regression tests by adding a “frame settling” capture strategy that waits (up to a bounded timeout) for two consecutive rendered frames to match before saving/comparing screenshots. This helps reduce flaky baselines caused by transient transitions/animations at capture time.
Changes:
- Add a stabilized screenshot capture path that compares consecutive frames in-memory until stable (bounded by timeout).
- Introduce capture stabilization timeout/interval constants and supporting pixel-copy helper.
- Route visual test capture through the new stabilization method.
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Anna Malchow-Perryman (apman)
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Fix flakey tests due to animated transitions still in progress at the time of the screenshots. This problem has so far only affected the ToggleSwitch, but as the new WinUI theme will contain more transitions, it was time to fix it before it gets too annoying.