[Webkit-unassigned] [Bug 57078] New: overflow:hidden <div> within z-index:1 <div> not clipped immediately during redraw when 3D CSS transform is used

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=57078

           Summary: overflow:hidden <div> within z-index:1 <div> not
                    clipped immediately during redraw when 3D CSS
                    transform is used
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: sprite+b.w.o at apple.com


Steps to reproduce: 

* Open the attached test case
* Click "Move layers"

Expected result:

* The words "Hello World" move upwards.

Actual result:

* The words "Hello World" does move upwards, but the content within the overflow:hidden is not clipped immediately during the redraw.
* This causes WebKit to briefly displays the content that should have been clipped when moving the <div> within the overflow:hidden layer vertically.

Notes:

* Reproducible on Safari 5.0.3 and WebKit (r81868) on Mac OS X 10.6.6.

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