[Webkit-unassigned] [Bug 129691] New: REGRESSION: Overlay scrollbars that have grown are sometimes askew in the track

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=129691

           Summary: REGRESSION: Overlay scrollbars that have grown are
                    sometimes askew in the track
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bdakin at apple.com


Overlay scrollbars that have grown are sometimes askew in the track. This started happening after we adopted the setPresentationValue ScrollbarPainter API which allowed us to update the position of the scrollbar knob from our secondary scrolling thread. This bug occurs when the scrollbar grows while it still thinks it is in presentation-value mode. Whenever the scrollbar grows, it should be in non-presentation value mode.

<rdar://problem/15666846>

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