[Webkit-unassigned] [Bug 89144] New: Avoid allocating huge layers for an element with a positioned child outside of its bounds

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=89144

           Summary: Avoid allocating huge layers for an element with a
                    positioned child outside of its bounds
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bdakin at apple.com
                CC: bdakin at apple.com, simon.fraser at apple.com


Created an attachment (id=147691)
 --> (https://bugs.webkit.org/attachment.cgi?id=147691&action=review)
Test case

In compositing scenarios like the one in the attached test case, we should put the gray box into its own layer, since it sits far outside of its parent, and backing store usage would be much lower that way.

<rdar://problem/10719381>

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