[Webkit-unassigned] [Bug 64010] In the preview theme of Gmail, yellow ad bar at the bottom won't repaint when scrolled

Thu Jul 7 15:19:52 PDT 2011

https://bugs.webkit.org/show_bug.cgi?id=64010

--- Comment #4 from Adrienne Walker <enne at google.com>  2011-07-07 15:19:52 PST ---
(In reply to comment #3)
> (In reply to comment #2)
> > I can't seem to reproduce this at ToT Chromium in Linux.  Does this happen in both Safari and Chromium?
> > 
> > Is this possibly triggered by compositing at all, such as a video or flash embedded in an email?
> 
> This happens almost all the time on Mac.  So maybe it's Mac-specific?  As far as I can tell, I haven't had any emails that had flash or video.

Ok, I repro'd on Linux by making an element in an email compositing by adding -webkit-transform:translateZ(0).  If I scroll such that the bar changes to overlap a composited element and become composited, then it causes the problem.

When that bar becomes composited, it looks like it doesn't invalidate the root layer where it used to be drawn.

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