bug#66382: 29.1; Prefixed find-file-at-point fails when ido-mode is active.

[Eli Zaretskii]

> Date: Fri, 6 Oct 2023 20:41:39 +0200
> From:  Stéphane Soppera via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Recipe to reproduce:
> 
>   emacs -Q
>   M-x ido-mode
>   M-x ffap-bindings
>   C-u M-x find-file-at-point RET
> 
> (any file can be used; the default `~/` on Unix works)
> 
> This fails with:
> 
>   apply: Wrong number of arguments: #<subr ido--ffap-find-file>, 2
> 
> After doing M-x toggle-debug-on-error, the full stack is:
> 
>   Debugger entered--Lisp error: (wrong-number-of-arguments #<subr 
> ido--ffap-find-file> 2)
>       ido--ffap-find-file("~/" t)
>       apply(ido--ffap-find-file ("~/" t))
>       #f(advice ido--ffap-find-file :override find-file)("~/" t)
>       funcall-interactively(#f(advice ido--ffap-find-file :override 
> find-file) "~/" t)
>       find-file-at-point()
>       funcall-interactively(find-file-at-point)
>       command-execute(find-file-at-point record)
>       execute-extended-command((4) "find-file-at-point" nil)
>       funcall-interactively(execute-extended-command (4) "find-file-at-point" 
> nil)
>       command-execute(execute-extended-command)
> 
> This regression seems to come from `(call-interactively
> ffap-file-finder)` with `(advice ido--ffap-find-file :override
> find-file)`. Since `ido--ffap-find-file` is not interactive, the
> `interactive` of `find-file` is used, which uses `find-file-read-args`
> which returns two arguments and not simply one.
> 
> The function `ido--ffap-find-file` was added to fix bug #50279.

Thanks, should be fixed now on the emacs-29 branch.