XChat version: 2.8.6
1. Tab completion of nicknames in x-chat does not work like tab completion of commands in bash.
2. This is confusing and frustrating for some (but not all) users.
3. Those users search for a way to change this behavior in the Settings->Preferences->Interface->Input box window and find nothing useful.
4. Those users search the Internet for information on changing the tab nick completion behavior. Perhaps they find it and perhaps they do not.
Place a SpinButton in System->Preferences->Interface->Input box to allow users to set completion_amount.