[Webkit-unassigned] [Bug 194798] New: [ Mac ] REGRESSION (r237924) Layout Test compositing/visible-rect/animated-from-none.html is flaky text diff failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=194798

            Bug ID: 194798
           Summary: [ Mac ] REGRESSION (r237924) Layout Test
                    compositing/visible-rect/animated-from-none.html is
                    flaky text diff failure
           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: sroberts at apple.com
                CC: lforschler at apple.com

The following layout test is flaky on Mac

compositing/visible-rect/animated-from-none.html

Probable cause:

Test started to become flaky after R237924. Prior revision passes. 

reproduced locally with:

run-webkit-tests compositing/visible-rect/animated-from-none.html --iterations 5000 -f --exit-after-n-failures=1 --no-retry-failures

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=compositing%2Fvisible-rect%2Fanimated-from-none.html

Diff:

--- /Volumes/Data/slave/mojave-release-tests-wk2/build/layout-test-results/compositing/visible-rect/animated-from-none-expected.txt
+++ /Volumes/Data/slave/mojave-release-tests-wk2/build/layout-test-results/compositing/visible-rect/animated-from-none-actual.txt
@@ -35,6 +35,7 @@
                   (position -100.00 0.00)
                   (bounds 200.00 200.00)
                   (contentsOpaque 1)
+                  (transform [1.00 0.00 0.00 0.00] [0.00 1.00 0.00 0.00] [0.00 0.00 1.00 0.00] [0.00 0.00 0.00 1.00])
                   (visible rect 100.00, 0.00 100.00 x 200.00)
                   (coverage rect 100.00, 0.00 500.00 x 200.00)
                   (intersects coverage rect 1)

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