[Webkit-unassigned] [Bug 80877] 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=80877


Simon Fraser (smfr) <simon.fraser at apple.com> changed:

           What    |Removed                     |Added
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                 CC|                            |simon.fraser at apple.com




--- Comment #3 from Simon Fraser (smfr) <simon.fraser at apple.com>  2012-07-28 20:02:55 PST ---
This is proving hard to fix. I have a patch, but it causes clip rect assertions. If we break apart a single compositing layer into multiple layers, then a layer RenderLayer B can have a parent, RenderLayer A, that is not its stacking context. When computing clip rects for A, it acts as the clipping root. When computing clip rects for B, we walk up through A, but are using a different clipping root. So we hit assertions.

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