[Webkit-unassigned] [Bug 46864] [chromium] disappearing scrollbar in accelerated compositing mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=46864





--- Comment #6 from Vangelis Kokkevis <vangelis at chromium.org>  2010-09-30 15:01:34 PST ---
(In reply to comment #5)
> > Is this a good opportunity to also take care of the FIXME at the top of this method?
> I was going to file a separate bug for that.
> 
> > Does this mean you'll now have damage in both the unscrolled location and the 
> > scrolled one? Could you just reset the m_rootLayerDirtyRect to be be equal to 
> > innerDamage?
> Uniting rather than reset is important. Consider when you have an animated image and you scrolled. The damage rect in that case has both the damage from the animation, and damage on the actual scrollbar that moved. Assigning innerDamage to the rootLayerDirtyRect would drop the srollbar damage and we'd see the scrollbar looking funky.

I chatted with Nat off line and I see now why this is necessary.  The patch looks good on my end.

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