bug#65414: save-some-buffers-functions are unexpectedly called when save-some-buffers pred is non-nil

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: Joseph Turner <joseph@breatheoutbreathe.in>,  Stefan Monnier
>  <monnier@iro.umontreal.ca>,  jonas@bernoul.li,  65414@debbugs.gnu.org
> Date: Sun, 03 Sep 2023 20:22:56 +0300
> 
> > Hmm... but how to make this change backward-compatible?  I mean, if
> > there's some function out there that is used in
> > save-some-buffers-functions, and it was written to accept only 2
> > arguments, we cannot safely call it with 3 arguments, can we?
> 
> If nothing else helps, just catch 'wrong-number-of-arguments',
> then call with an obsolete signature again.

I was hoping for a cleaner, more elegant solution.  Still do.