[Webkit-unassigned] [Bug 78439] New: [Windows] Dragged-out tab mini-windows appear blank when page is in accelerated compositing mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=78439

           Summary: [Windows] Dragged-out tab mini-windows appear blank
                    when page is in accelerated compositing mode
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows 7
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aestes at apple.com
                CC: aroben at apple.com
            Blocks: 77382


Steps to reproduce:

1) Go to http://www.apple.com/iphone/
2) Drag the tab out of the Safari window

Expected result:
The mini-window should contain a snapshot of the tab's contents.

Actual result:
The mini-window is blank.

I believe this also causes pixel test results of compositing tests to be blank on Windows. This blocks testing the accelerated part of <https://bugs.webkit.org/show_bug.cgi?id=77382>.

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