77: Refined autocomplete UI.
Append ": " on accepting a nick at beginning of the line.
Issue: Autocomplete tooltip remains after pressing enter while a suggestion was presented.
Tab will initiate a scan and place first suggestion inline in editor.
The tooltip will appear showing all suggestions with an indicator on the current inlined suggestion.
Press Escape to reject suggestion and inline suggestion is replaced with original text.
Successive tabs will cycle through the suggestions inline in the editor.
User accepts the suggestion by typing anything else or pressing Enter. The tooltip is then closed.