[Webkit-unassigned] [Bug 233141] New: "Pinch to tab overview" browser gesture occasionally fires despite defaultPrevent()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=233141

            Bug ID: 233141
           Summary: "Pinch to tab overview" browser gesture occasionally
                    fires despite defaultPrevent()
           Product: WebKit
           Version: Safari 15
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: UI Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dan at moqups.com

Created attachment 444282

  --> https://bugs.webkit.org/attachment.cgi?id=444282&action=review

DOM event logger for wheel, touch, and gesture events.

Despite gesturestart/gesturechange/gestureend all being defaultPrevented, the "pinch to zoom out to all tabs"  browser gesture in Safari still fires occasionally. I've attached a test case and will annex a video repro for the bug.

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