[Webkit-unassigned] [Bug 193091] New: [ Mojave WK1 ] Four Layout Tests in fast/repaint/* are flaky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193091

            Bug ID: 193091
           Summary: [ Mojave WK1 ] Four Layout Tests in fast/repaint/* are
                    flaky
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tsavell at apple.com
                CC: lforschler at apple.com

The following layout tests are flaky on Mojave WK1

fast/repaint/fixed.html
fast/repaint/fixed-to-relative-position-with-absolute-child.html
fast/repaint/fixed-scale.html
fast/repaint/absolute-position-changed.html

Probable cause:

These four image tests fail in tandem. All three tests seem to be drawing boxes, and incorrectly zooming in on the results. 

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Frepaint%2Ffixed.html%20fast%2Frepaint%2Ffixed-to-relative-position-with-absolute-child.html%20fast%2Frepaint%2Ffixed-scale.html%20fast%2Frepaint%2Fabsolute-position-changed.html

Links to image diffs:

fast/repaint/absolute-position-changed.html
https://build.webkit.org/results/Apple%20Mojave%20Release%20WK1%20(Tests)/r239577%20(1897)/fast/repaint/absolute-position-changed-diffs.html

fast/repaint/fixed-scale.html
https://build.webkit.org/results/Apple%20Mojave%20Release%20WK1%20(Tests)/r239577%20(1897)/fast/repaint/fixed-scale-diffs.html

fast/repaint/fixed-to-relative-position-with-absolute-child.html
https://build.webkit.org/results/Apple%20Mojave%20Release%20WK1%20(Tests)/r239577%20(1897)/fast/repaint/fixed-to-relative-position-with-absolute-child-diffs.html

fast/repaint/fixed.html
https://build.webkit.org/results/Apple%20Mojave%20Release%20WK1%20(Tests)/r239577%20(1897)/fast/repaint/fixed-diffs.html

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