NEW 101028
Lion: Project Activity Feed on phabricator.org doesn't repaint on scroll 
https://bugs.webkit.org/show_bug.cgi?id=101028
Summary Lion: Project Activity Feed on phabricator.org doesn't repaint on scroll
Ryosuke Niwa
Reported 2012-11-02 02:08:47 PDT
Created attachment 172008 [details] Repaint issue Reproduction steps: 1. Visit http://phabricator.org/ on ToT Safari on Lion 10.7.5. 2. Scroll down to "Project Activity Feed" 3. Wheel-scroll on the feed downwards fast (don't click inside the feed or the scrollbar) Expected result: The feed scrolls. Actual result: It doesn't repaint properly. See the attachment.
Attachments
Repaint issue (263.44 KB, image/png)
2012-11-02 02:08 PDT, Ryosuke Niwa 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Simon Fraser (smfr)
Comment 1 2012-11-02 08:59:00 PDT
Do we know when this regressed?
Radar WebKit Bug Importer
Comment 2 2012-11-02 08:59:17 PDT
<rdar://problem/12624416>
Ryosuke Niwa
Comment 3 2012-11-02 09:46:52 PDT
(In reply to comment #1) > Do we know when this regressed? It reproduces on Safari 6.0 as well so it must be an old bug. Disabling compositing didn't help either.
Ryosuke Niwa
Comment 4 2012-11-02 09:48:02 PDT
I'll note that I could not reproduce the bug on the stable version of Chromium Mac.
Simon Fraser (smfr)
Comment 5 2012-11-02 10:23:50 PDT
I can't reproduce. Does this only happen when zoomed, or on a Retina display?
Ryosuke Niwa
Comment 6 2012-11-02 10:29:31 PDT
(In reply to comment #5) > I can't reproduce. Does this only happen when zoomed, or on a Retina display? Retina or Lion might be required. I can’t reproduce on my Mountain Lion MacPro.
Simon Fraser (smfr)
Comment 7 2012-11-02 10:37:40 PDT
This happens when accelerated drawing is off, and overlay scrollbars on on. Scrolling the overflow picks up bits of the horizontal scrollbar.
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