[Webkit-unassigned] [Bug 213407] New: REGRESSION (263121) [ Catalina Debug ] media/video-fullscreen-only-playback.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=213407

            Bug ID: 213407
           Summary: REGRESSION (263121) [ Catalina Debug ]
                    media/video-fullscreen-only-playback.html is a flaky
                    failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rackler at apple.com

media/video-fullscreen-only-playback.html

This test appears to have become flaky with the changes in r263121.  We were able to reproduce this with this command:
run-webkit-tests --iterations 2000 --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --debug-rwt-logging --no-retry --force --no-build -f --debug  media/video-fullscreen-only-playback.html

History: 
https://results.webkit.org/?suite=layout-tests&test=media%2Fvideo-fullscreen-only-playback.html&platform=ios&platform=mac

Diff: 
--- /Volumes/Data/slave/catalina-debug-tests-wk2/build/layout-test-results/media/video-fullscreen-only-playback-expected.txt
+++ /Volumes/Data/slave/catalina-debug-tests-wk2/build/layout-test-results/media/video-fullscreen-only-playback-actual.txt
@@ -12,6 +12,7 @@
 ** Entered fullscreen
 RUN(video.webkitExitFullScreen())
 EVENT(webkitpresentationmodechanged)
+EVENT(webkitpresentationmodechanged)
 EXPECTED (video.webkitDisplayingFullscreen == 'false') OK

 ** Exited fullscreen

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