Bug 85647

Summary: box-shadow causes overlay scrollbars to be in the wrong position when element is composited
Product: WebKit Reporter: Thomas Fuchs <thomas>
Component: New BugsAssignee: Simon Fraser (smfr) <simon.fraser>
Status: RESOLVED FIXED    
Severity: Normal CC: bdakin, eric, jamesr, mitz, simon.fraser, webkit-bug-importer, webkit.review.bot
Priority: P2 Keywords: InRadar
Version: 528+ (Nightly build)   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
reduced test case
none
Patch jamesr: review+

Thomas Fuchs
Reported 2012-05-04 11:49:56 PDT
Created attachment 140290 [details] reduced test case Using CSS `box-shadow` on an element that shows scrollbars (overflow: auto) can cause the scrollbars of the element to appear in the wrong position. A related problem is that in the provided reduced test case, enabling hardware acceleration for the parent element causes the child's scrollbars to disappear completely. This problem happens in both the latest release version of Chrome and in the Safari 5.2 beta (I could not test on Safari 5.1, but it is likely to be a problem there too).
Attachments
reduced test case (1.29 KB, text/html)
2012-05-04 11:49 PDT, Thomas Fuchs 		no flags
Details
Patch (9.00 KB, patch)
2012-09-07 14:47 PDT, Simon Fraser (smfr) 		jamesr: review+
DetailsFormatted DiffDiff
View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2012-05-04 11:52:16 PDT
<rdar://problem/11386222>
Simon Fraser (smfr)
Comment 2 2012-05-04 11:57:40 PDT
I can't find any code that positions the scrollbar layers in RenderLayerBacking. Weird.
Simon Fraser (smfr)
Comment 3 2012-09-07 14:47:51 PDT
Created attachment 162874 [details] Patch
Simon Fraser (smfr)
Comment 4 2012-09-07 17:49:00 PDT
http://trac.webkit.org/changeset/127943
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