GNOME Bugzilla – Bug 641839
border + background-image = background-color
Last modified: 2011-02-08 15:28:56 UTC
add border: 1px solid #ff0000; to the ".app-well-app > .overview-icon" rule in gnome-shell.css, restart, and go into the overview. All the apps will have a red border, but the running apps will have a red background as well. This is triggered by the use of background-image in the ".app-well-app.running" rule. I poked a bit at st-theme-node-drawing.c, but figured someone else could find the problem faster.
Yeah, there's even a patch for it actually ... *** This bug has been marked as a duplicate of bug 640465 ***