Bug 303464 – [scroll-anchoring] some WPT `scroll-animations` tests are flaky `ImageOnlyFailure` only with `CSSScrollAnchoringEnabled` on Intel

• Component: Scrolling
• Status: REOPENED

[Antoine Quint]

The following WPT tests are flaky `ImageOnlyFailure` if `ThreadedScrollDrivenAnimationsEnabled` is enabled:

- scroll-animations/css/scroll-timeline-default-quirks-mode.html
- scroll-animations/css/scroll-timeline-default-writing-mode-rl.html
- scroll-animations/css/scroll-timeline-default.html
- scroll-animations/css/scroll-timeline-frame-size-changed.html
- scroll-animations/css/scroll-timeline-inline-orientation.html

[Radar WebKit Bug Importer]

<rdar://problem/165750739>

[Antoine Quint]

I now notice these flaky failures only happen when scroll anchoring is enabled.

[Antoine Quint]

According to the bots:

https://results.webkit.org/?suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fscroll-animations%2Fcss%2Fscroll-timeline-inline-orientation.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fscroll-animations%2Fcss%2Fscroll-timeline-frame-size-changed.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fscroll-animations%2Fcss%2Fscroll-timeline-default.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fscroll-animations%2Fcss%2Fscroll-timeline-default-writing-mode-rl.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fscroll-animations%2Fcss%2Fscroll-timeline-default-quirks-mode.html

… these tests are now only flaky on Intel. I'm going to reclassify them as such.

[Antoine Quint]

Pull request: https://github.com/WebKit/WebKit/pull/58611

[EWS]

Committed 307451@main (b1cff341d880): <https://commits.webkit.org/307451@main>

Reviewed commits have been landed. Closing PR #58611 and removing active labels.

[Antoine Quint]

Keeping this around in case we want to fix the Intel flakiness.