[Webkit-unassigned] [Bug 58515] New: Translucent scrollbars on composited layers render incorrectly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=58515

           Summary: Translucent scrollbars on composited layers render
                    incorrectly
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jamesr at chromium.org
                CC: sam at webkit.org, bdakin at apple.com,
                    simon.fraser at apple.com


See the attached test case.  It appears that when the RenderLayer owning the scrollbars becomes composited we somehow render the translucent scrollbars twice on top of each other or something of the like.  I can reproduce the issue in Chromium, WebKit nightlies, and minibrowser.  The patch on bug 57202 ensures that this bug doesn't happen when the overflow controls are on their own layer, but it doesn't help when the controls are not.

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