[Webkit-unassigned] [Bug 193107] New: [ Mojave WK1 ] Layout Test fast/layers/blank-content-when-child-layer-is-at-negative-big-number.html and fast/layers/wrong-clipping-semi-transparent-compositing-layer-on-subpixel-position.html are flaky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193107

            Bug ID: 193107
           Summary: [ Mojave WK1 ] Layout Test
                    fast/layers/blank-content-when-child-layer-is-at-negat
                    ive-big-number.html and
                    fast/layers/wrong-clipping-semi-transparent-compositin
                    g-layer-on-subpixel-position.html 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/layers/blank-content-when-child-layer-is-at-negative-big-number.html
fast/layers/wrong-clipping-semi-transparent-compositing-layer-on-subpixel-position.html

Probable cause:

These two tests are failing in tandem. They seem to be drawing something and unexpectedly zooming in on the result. similar to https://bugs.webkit.org/show_bug.cgi?id=192881 and https://bugs.webkit.org/show_bug.cgi?id=193091

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Flayers%2Fblank-content-when-child-layer-is-at-negative-big-number.html%20fast%2Flayers%2Fwrong-clipping-semi-transparent-compositing-layer-on-subpixel-position.html

Image diffs:

fast/layers/blank-content-when-child-layer-is-at-negative-big-number.html
https://build.webkit.org/results/Apple%20Mojave%20Release%20WK1%20(Tests)/r239589%20(1907)/fast/layers/blank-content-when-child-layer-is-at-negative-big-number-diffs.html

fast/layers/wrong-clipping-semi-transparent-compositing-layer-on-subpixel-position.html
https://build.webkit.org/results/Apple%20Mojave%20Release%20WK1%20(Tests)/r239589%20(1907)/fast/layers/wrong-clipping-semi-transparent-compositing-layer-on-subpixel-position-diffs.html

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