Bug 132100

Summary:	Subpixel rendering: RenderLayer's dirtyrect/clipping should device pixelsnap the same way painting does.
Product:	WebKit	Reporter:	zalan <zalan>
Component:	Layout and Rendering	Assignee:	zalan <zalan>
Status:	ASSIGNED ---
Severity:	Normal	CC:	simon.fraser
Priority:	P2
Version:	528+ (Nightly build)
Hardware:	Unspecified
OS:	Unspecified

Description zalan 2014-04-23 19:37:11 PDT

Currently it uses enclosingrect. (selfClipRect(), childrenClipRect(). see paintDirtyRect = selfClipRect(); at RenderLayer::paintLayerContents
(when css overflow: scroll etc is present, it results in wrong cliprects)
<div id='foo' style="overflow: scroll; display: none; border: 1px solid black; position: fixed; left: 10px; top: 10.3px; width: 20px; height: 20.1px;"></div>