Open MailNews. Notice all folder pane twisty triangles are black. Move the mouse over some of the the twisty entries (without clicking). Notice the twisties turning grey. Click on a random folder pane entry. Notice all twisties becoming black again. This doesn't look as if it is intentional...
Dupe of bug 301060?
Hard to say - the twisties in 301060 are always grey for me, but flicker shortly when a treeitem is selected.
You need to log in before you can comment on or make changes to this bug.