Bug 101028 - Lion: Project Activity Feed on phabricator.org doesn't repaint on scroll
Summary: Lion: Project Activity Feed on phabricator.org doesn't repaint on scroll
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Layout and Rendering (show other bugs)
Version: 528+ (Nightly build)
Hardware: Unspecified OS X 10.7
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2012-11-02 02:08 PDT by Ryosuke Niwa
Modified: 2012-11-02 10:39 PDT (History)
4 users (show)

See Also:

Attachments
Repaint issue (263.44 KB, image/png)
2012-11-02 02:08 PDT, Ryosuke Niwa 		no flags Details
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Description Ryosuke Niwa 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.
Comment 1 Simon Fraser (smfr) 2012-11-02 08:59:00 PDT 
Do we know when this regressed?
Comment 2 Radar WebKit Bug Importer 2012-11-02 08:59:17 PDT 
<rdar://problem/12624416>
Comment 3 Ryosuke Niwa 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.
Comment 4 Ryosuke Niwa 2012-11-02 09:48:02 PDT 
I'll note that I could not reproduce the bug on the stable version of Chromium Mac.
Comment 5 Simon Fraser (smfr) 2012-11-02 10:23:50 PDT 
I can't reproduce. Does this only happen when zoomed, or on a Retina display?
Comment 6 Ryosuke Niwa 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.
Comment 7 Simon Fraser (smfr) 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.