[Webkit-unassigned] [Bug 217540] New: REGRESSION (r266972): [ Mojave+ debug wk2 ] compositing/animation/repaint-after-clearing-shared-backing.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217540

            Bug ID: 217540
           Summary: REGRESSION (r266972): [ Mojave+ debug wk2 ]
                    compositing/animation/repaint-after-clearing-shared-ba
                    cking.html is a flaky failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rackler at apple.com

Description:
compositing/animation/repaint-after-clearing-shared-backing.html

The first failure that I see this on the dashboard was 09/12/20 at r266974, but is not relevant to what would have caused this.
The test was introduced at r266972 and has been flaky failure since then.

The test was expecting a fader margin: 50px;height: 200px;background-color: rgba(255, 255, 255, 0.5); but returned fader with larger width and position higher.

REPRODUCTION STEPS
Command: 
run-webkit-tests --exit-after-n-failures 1 --iterations 50 --debug compositing/animation/repaint-after-clearing-shared-backing.html

Result: 
Regressions: Unexpected image-only failures (1)
  compositing/animation/repaint-after-clearing-shared-backing.html [ ImageOnlyFailure ]

History:
https://results.webkit.org/?suite=layout-tests&test=compositing%2Fanimation%2Frepaint-after-clearing-shared-backing.html&limit=50000&platform=mac&style=debug&flavor=wk2

Image Results:
https://build.webkit.org/results/Apple-Mojave-Debug-WK2-Tests/r268273%20(12483)/compositing/animation/repaint-after-clearing-shared-backing-diffs.html

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