f2f2898fe3
The underline highlights on the panel menu items normally have a 100ms transition between highlighted and unhighlighted, but the panel corner graphics can't do that, so we hacked the Activities button and user menu to have no transition. But in gdm mode, the user menu isn't the rightmost item any more. Fix this by modifying the CSS from the code instead. https://bugzilla.gnome.org/show_bug.cgi?id=651299
