AdiIRC

Nick autocomplete (activated via tab-key) exhibits buggy behaviour if there are more than one users with nicks beginning with the same letter.

For example, if both User0001 and User0002 are on a channel, and the autocomplete string is set to ": " or ", ",
typing U and pressing tab would result in a predictable "User0001:". However, hitting tab one more time results in "ususer0002" instead of "User0002:". Sometimes only the first letter is repeated (kkkraz instead of kraz, for instance), and sometimes two, depending on the nick. We used UTF-8 in all cases.

Furthermore, hitting tab a few times in short succession may cause the automplete feature to append a nick from the top of the userlist to the autocompleted nick. If, for example, we have the following users on a channel: A_user, User0001 and User0002, hitting tab a few times in succession would result in the following input field string: User0001: A_user.