[Webkit-unassigned] [Bug 60421] New: Custom scrollbars nested inside an overlay scrollbar overflow region end up painting twice

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=60421

           Summary: Custom scrollbars nested inside an overlay scrollbar
                    overflow region end up painting twice
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: HasReduction, InRadar
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bdakin at apple.com


Right now any overflow region with overlay scrollbars will cause a second pass through the layer tree to paint said scrollbars. Except right now both passes end up painting custom css scrollbars.

Patch forthcoming.

<rdar://problem/9389072>

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