[Webkit-unassigned] [Bug 106712] New: Fixed elements jiggle during scroll on some sites that cause layouts with an onscroll handler

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=106712

           Summary: Fixed elements jiggle during scroll on some sites that
                    cause layouts with an onscroll handler
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bdakin at apple.com


This affects redfin.com and possibly other sites as well. Reduction attached.

If you scroll the test case, the green box sometimes jiggles inappropriately. The test has Javascript that runs during an onscroll handler which forces a layout. I believe that the jiggling is happening because the main thread doesn't have the updated scroll position from the scrolling thread.

I'm not sure how to address this problem.

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