[Webkit-unassigned] [Bug 102836] New: Compositing layer momentarily disappearing when increasing in height in Safari

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=102836

           Summary: Compositing layer momentarily disappearing when
                    increasing in height in Safari
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.8
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: johnbarr at google.com
                CC: simon.fraser at apple.com


Created an attachment (id=175275)
 --> (https://bugs.webkit.org/attachment.cgi?id=175275&action=review)
a repro case

Affects:
- iOS 6 Safari, iPad + iPod
- Desktop Safari Version 6.0.1 (8536.26.14) on a OSX version 10.8.2
Other browsers tested:
- Chrome mobile + Chrome desktop (not affected)

In the attached repro case a composting layer (blue) is growing larger due to a child (red) being hidden/shown.
This is causing the layer behind the blue layer (green) to be shown momentarily where the blue "Before Text" is even though this portion of the layer is not changing.

Note that making textDiv a compositing layer does not help. Additionally toggling making textDiv overflow:hidden and toggling its height between a small and large value produces the same effect.

Bug:
  Compositing layer momentarily disappearing when increasing in height in Safari.

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