[Webkit-unassigned] [Bug 114825] Garbage at the top of http://www.technologyreview.com after scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=114825


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

           What    |Removed                     |Added
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                 CC|                            |shawnsingh at chromium.org




--- Comment #2 from Simon Fraser (smfr) <simon.fraser at apple.com>  2013-04-24 17:55:07 PST ---
The element showing the garbage pixels has visibility:hidden, which is not considered by RenderLayer::backgroundIsKnownToBeOpaqueInRect().

Another change I notice that affects this is https://bugs.webkit.org/show_bug.cgi?id=108118. Before that revision, we'd compute that the fixed position element is a simple container layer (yellow border). After that change, it became something that draws content.

I haven't been able to make a useful reduction. Most of the time, visibility:hidden just causes us to not parent the compositing layer.

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