[Webkit-unassigned] [Bug 212429] New: Bad main thread latching with this testcase

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212429

            Bug ID: 212429
           Summary: Bad main thread latching with this testcase
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

Created attachment 400373

  --> https://bugs.webkit.org/attachment.cgi?id=400373&action=review

testcase

Put your cursor in the top right area of the "passive" box, and swipe to scroll down. The scroll will get trapped by the active box.

This is caused by bad latching logic in the EventHandler code.

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