Tab completion of conference room nicknames
Would be handy to have some form of tab completion of nicknames in a muc/conference room. Main question here is, exactly where do we handle this. Really use tabs? because tabs are used for actual tab input right now. Will have to consider the best scenario. Might be nice to embrace some sort of "last person who mentioned your name -> last person who you communicated with -> last person to join the room ...." type of algorithm.
added in revision 12166
CTRL-SPACE auto-completes, TAB is used for actual Tabbing