Comment 4 for bug 484975

Well, this isn't really part of the same bug, but since you asked:

In 0.3.2.1, when closing a window causes an icon to disappear from the bar, the bar smoothly shrinks, and the other icons glide to the right until they are centered again. In the beta, the bar still shrinks smoothly, but instead of gliding, the remaining icons abruptly jump to their new position. I find this jarring and prefer 0.3.2.1's behavior. I looked for a configuration option to control this but didn't find one.

I assumed it was something you were still working on, since I imagine there was considerable effort expended in making the current version handle it so elegantly.

Also, I didn't see a separator bar in the beta. There's a color option for it in the theme editor but it didn't seem to affect anything.