[Webkit-unassigned] [Bug 171652] New: Avoid descending to sublayers when coverage rect doesn't change

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=171652

            Bug ID: 171652
           Summary: Avoid descending to sublayers when coverage rect
                    doesn't change
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: koivisto at iki.fi
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Currently NeedsComputeVisibleAndCoverageRect is treated as a change that affects sublayers. This is unnecessary if nothing actually changes as a result of the computation.

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