Created attachment 603212 [details]
Screenshot of the issue
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:13.0) Gecko/20120305 Firefox/13.0a1
Build ID: 20120305031045
Steps to reproduce:
It is originally posted at http://forums.mozillazine.org/viewtopic.php?f=23&t=2439215.
It is a local firefox community forum in Chinese using phpBB.
At the bottom there is a preview pane of previous replies. If I scroll up and down inside the preview pane, sometimes the pictures in it are rendered outside the pane overlapping other contents. It returns to normal position after a second or so.
Last good nightly: 2012-02-16
First bad nightly: 2012-02-17
The issue is not reproducible if hardware acceleration is disabled.
Timothy, any idea what could be the problem here?
I can see it on Mac too. Based on that I'm suspecting bug 727661.
Confirmed that bug 727661 is the cause.
Might be fixed by bug 735141.
Adding qawanted to confirm that bug 735141 possibly fixed - STR in comment 0
(In reply to Lukas Blakk [:lsblakk] from comment #5)
> [Triage Comment]
> Adding qawanted to confirm that bug 735141 possibly fixed - STR in comment 0
Apparently this landed in Aurora on March 21st. I tested Firefox 13.0a2 Aurora 2012-03-20 and cannot reproduce this bug. Therefore, I cannot claim bug 735141 fixed this bug. Seems as though it could have been fixed beforehand.
Let's call this fixed. If not please reopen.