AdiIRC

If a user has a nickname like baab, gaae or ghjfdgkjfhdgkjaabgfdh, the tabcomplete can't complete the nick when you write up to the first of the double a's.
b[tab] works
ba[tab] doesn't work
baa[tab] works

Tested on the newest beta and on 1.8.3

Doesn't seem to be on other double characters like bb, cc or something else.