[Webkit-unassigned] [Bug 223655] New: [GLIB] webanimations/transform-transition-with-delay-on-forced-layer-with-transform.html is flaky image failing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=223655

            Bug ID: 223655
           Summary: [GLIB]
                    webanimations/transform-transition-with-delay-on-force
                    d-layer-with-transform.html is flaky image failing
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: lmoura at igalia.com
                CC: dino at apple.com, graouts at apple.com

Created attachment 424061

  --> https://bugs.webkit.org/attachment.cgi?id=424061&action=review

Manual test

webanimations/transform-transition-with-delay-on-forced-layer-with-transform.html

Added in r273656, it's flaky showing the actual image to be already scaled down. Likely missing to implement the same fix in the texmap animations? From the revision comments:

> Prior to this patch, this test failed because, while in the delay phase, the transition would mean the underlying transform was applied twice: once by the non-interpolating animation generated for the underlying "transform" value, and once by the first keyframe of the transition since it fills backwards.

Manually testing with both Epiphany 2.30.5 and MiniBrowser ToT, the old behavior is still present.

Attached is a manual test based on the original layout test, with a shorter delay.

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