nsStylePosition::CalcDifference returns a reflow hint for z-index changes. This should probably need no more than a SyncFrameView hint, or RepaintFrame hint. See bug 502288 comment 2.
Oh, and maybe we should do clip here too... that ought not need to reflow either.
We don't really need SyncFrameView anymore, view z-indexes don't really do anything. They used to sort of affect widget ordering but that's irrelevant now, certainly for Web content.
So this should just be a RepaintFrame, right?
I think so.
Created attachment 408408 [details] [diff] [review] Fix
Assignee: nobody → bzbarsky
Status: NEW → ASSIGNED
Attachment #408408 - Flags: review?(roc)
Attachment #408408 - Flags: review?(roc) → review+
Status: ASSIGNED → RESOLVED
Last Resolved: 9 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla1.9.3a1
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