Make activity visible in tab
Just found out, that you can arange those buffer views as tabs. This is awesome. But now, if someone write me a message in the tab "bitlbee", and I'm currently in tab "unread messages", I won't get any notice that someone wrote me something (unless a highlight rule is matching and a tooltip is showing up).
So, just assign the right "activity" color to the tab as well (as seen in the "fixed" image)