bug#6795: rcirc: ERR_NICKNAMEINUSE causes infinite loop under certain circumstances

[Lars Ingebrigtsen <larsi@gnus.org>]

Deniz Dogan <deniz.a.m.dogan@gmail.com> writes:

> Currently rcirc-handler-433 (ERR_NICKNAMEINUSE) tries to "uniquify"
> the nickname the user tried to use by appeding a ` to the requested
> nickname. However, if the length of the requested nickname is as long
> as or longer than the maximum allowed length on the server, the
> "uniquification" will not work resulting in an attempt to switch to
> the same nickname that caused the error in the first place:
>
> Example:
> /nick superlongnickname
> *** 433 superlongn Nickname is already in use.
>
> Here the IRC server truncates the requested nickname to "superlongn"
> which is already taken and then it tries to change to
> "superlongnickname`" which of course will also be truncated to
> "superlongn". Hence, something like this will be printed in the server
> buffer:
>
> *** 433 superlongn Nickname is already in use.
> *** 433 superlongn Nickname is already in use.
> *** 433 superlongn Nickname is already in use.
> *** 433 superlongn Nickname is already in use.

This should now be fixed in Emacs 28.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no