[Webkit-unassigned] [Bug 109966] Early out of RenderLayer::updateCanBeStackingContainer more often

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=109966





--- Comment #1 from vollick at chromium.org  2013-02-15 13:28:28 PST ---
More context: If we don't scroll overflow, then the value of m_canBeStackingContainer isn't useful. It would be nice to avoid computing it if we don't have to. For this to work reliably, we need to dirty this value whenever we start scrolling overflow, and freshen it in RenderLayer::styleChanged.

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