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

[bugzilla-daemon at webkit.org]

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

--- Comment #3 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Comment on attachment 309034
  --> https://bugs.webkit.org/attachment.cgi?id=309034
patch

Does this help performance in some scenario not mentioned here?

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