Bug 33965

Summary:	Clean up code that repositions scrollbars on painting
Product:	WebKit	Reporter:	Simon Fraser (smfr) <simon.fraser>
Component:	Layout and Rendering	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal
Priority:	P2
Version:	528+ (Nightly build)
Hardware:	Mac
OS:	OS X 10.5

Description Simon Fraser (smfr) 2010-01-21 12:14:31 PST

Bug 33927 fixed an issue with plugin widgets caused by the fact that we use tx,ty to position widgets during painting. This is wrong, since tx and ty may be relative to some compositing layer.

The same issue exists with scrollbars, which get repositioned in RenderLayer::positionOverflowControls(). We should update the scrollbar positions eagerly after scrolling, as we do for RenderWidgets.