Better MUC invitations support
For now, indirect MUC invitations are shown as if the room sent a normal message, displayed in a ChatTab. We then have to type “/join the_room_jid”. The MucTab opens normally, but the ChatTab stays, and we send chatstates to it each time we show it.
A better approch would be to determine the invitation is a MUC invitation and directly open a MucTab, with some dialog asking if we want to go to this room or not.