bug#72329: Avoid recursion in gnus-message-citation-mode

[Eli Zaretskii <eliz@gnu.org>]

Ping! Ping!  Eric, any comments?

> Cc: 72329@debbugs.gnu.org, thuna.cing@gmail.com
> Date: Sat, 17 Aug 2024 10:29:31 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> Ping! Eric, any comments?
> 
> > Cc: 72329@debbugs.gnu.org
> > Date: Fri, 02 Aug 2024 10:27:54 +0300
> > From: Eli Zaretskii <eliz@gnu.org>
> > 
> > > From: Thuna <thuna.cing@gmail.com>
> > > Date: Sun, 28 Jul 2024 03:30:40 +0200
> > > 
> > > In `gnus-message-citation-mode' the
> > > 
> > >   (if (not font-lock-mode)
> > >       (gnus-message-citation-mode (font-lock-mode 1))
> > >     ...)
> > > 
> > > can lead to excessive nesting if font-lock-mode fails to be set (quick
> > > enough or altogether).  Changing this with
> > > 
> > >   (while (not font-lock-mode) (font-lock-mode 1))
> > >   ...
> > > 
> > > should be better, assuming it is necessary for `font-lock-mode' to be
> > > called repeatedly, otherwise
> > > 
> > >   (font-lock-mode 1)
> > >   (while (not font-lock-mode))
> > >   ...
> > > 
> > > might also work, or simply
> > > 
> > >   (font-lock-mode 1)
> > >   ...
> > > 
> > > if it is not necessary to wait.
> > > 
> > > One possible problem with these arrangements is that it may be desirable
> > > to error in case there is an issue which prevents font-lock-mode from
> > > being set perpetually, in which case something like
> > > 
> > >   (font-lock-mode 1)
> > >   (with-timeout (<however-long-before-giving-up>
> > >                  (error "Failed to enable `font-lock-mode'."))
> > >     (while (not font-lock-mode)))
> > >   ...
> > > 
> > > might be preferable.
> > 
> > Thanks.
> > 
> > Eric, any comments or suggestions?
> > 
> > 
> > 
> > 
> 
> 
> 
>