[Webkit-unassigned] [Bug 197975] REGRESSION (r245170): gmail.com header flickers when hovering over the animating buttons

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197975

--- Comment #3 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
I think this is about a negative z-index child that causes its enclosing stacking context to become composited late. If that layer was sharing, we make it non-sharing, but leave the overlap map in a bad state.

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