[Webkit-unassigned] [Bug 90419] When overlap testing, compute regions relative to some container, not absolute

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=90419





--- Comment #5 from Simon Fraser (smfr) <simon.fraser at apple.com>  2012-07-07 11:48:28 PST ---
For some reason I'm finding it really hard to fix this. The OverlapMap messes with my brain.

As well as mapping regions in the overlap map up through transforms, we need to also clip them. I think this is very similar to what RenderObject::computeRectForRepaint() does, but that is designed to be called during layout.

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