[Webkit-unassigned] [Bug 68777] New: Absolute child is not repainted when parent opacity changes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=68777

           Summary: Absolute child is not repainted when parent opacity
                    changes
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: pdr at google.com
                CC: knorton at google.com


Created an attachment (id=108608)
 --> (https://bugs.webkit.org/attachment.cgi?id=108608&action=review)
Repro case showing incorrect child repaint

Changing the opacity of a parent should trigger a repaint on all children but absolutely positioned children are not repainted correctly. Instead of repainting the entire child, only the parts of the child that are in the parent's bounding box are repainted (see attached repro).

Tested on WebKit nightly @r95921/Mac, Chrome 16.0.889.0/Mac, and Chrome 14.0.835.186/Linux

As a workaround users can force a repaint by setting opacity=0.999 on the child.

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