912686 - With regular themes, switching scrollbar styles causes scrollbars to disappear

Status: NEW

(Core :: Widget: Cocoa, defect)

Description

[Stephen A Pohl [:spohl] (OOO until 9/9)]

Although bug 870941 was fixed, some themes continue to cause the scrollbars to disappear when the scrollbar style changes from regular to overlay or vice-versa. One theme that has this issue is mx4 [1]. However, other themes don't have this problem [2]. It is currently hard to tell how widespread this issue is, or if only mx4 is affected.

STR:
1. Install mx4
2. Navigate to page with scrollbars (for example http://news.google.com)
3. Open System Preferences > General
4. Switch the options of "Show scroll bars:" between "When scrolling" and "Always"

Result:
Same scrollbar artifacts as reported in bug 870941. No usable scrollbars displayed.

[1] https://addons.mozilla.org/en-US/firefox/addon/mx4/
[2] https://addons.mozilla.org/en-US/firefox/addon/ballooning-clouds-planets/

Comment 1

[Stephen A Pohl [:spohl] (OOO until 9/9)]

This seems to affect regular themes. Light-weight themes don't seem affected.

Wrote post in MozillaZine with suggested fix for themes:
http://forums.mozillazine.org/viewtopic.php?f=18&t=2747741&e=0