closing groupchat windows ask the question twice
If you join a groupchat, and choose to close the windows, the question about "are you sure you want to leave" is asked two time. This doesn't occurs when you have more than one tab opened. Step to reproduce : run gajim. join a groupchat, and only one close the windows, say "ok" on the first dialog say "ok" or "cancel" on second one will not change anything.
the secund dialog should not be there.