[Webkit-unassigned] [Bug 31324] New: Iframe overlap testing fails to detect overlapping objects in the same layer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=31324

           Summary: Iframe overlap testing fails to detect overlapping
                    objects in the same layer
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mitz at webkit.org
                CC: simon.fraser at apple.com


Iframes use the OverlapTestRequest mechanism to detect when they are overlapped
and disable copy-on-scroll in that case. The mechanism detects overlapping
layers, but fails to detect overlapping objects in the same layer as the
iframe. The attached test case demonstrates the bug.

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