[Webkit-unassigned] [Bug 120142] New: When compositing layers are removed, we can repaint the wrong layer 3 times

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=120142

           Summary: When compositing layers are removed, we can repaint
                    the wrong layer 3 times
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: https://bugs.webkit.org/attachment.cgi?id=209310
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com


RenderLayerCompositor::layerWillBeRemoved() gets called 3 times when a single RenderLayer is being removed, and those 3 repaints can go into wrong layer, because teh compositing ancestor is not the layer that the renderer will go into now it no longer has a layer (it may go into a previous sibling).

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