bug#64046: 30.0.50; Quoting in customize choice tags

[Mauro Aranda <maurooaranda@gmail.com>]

Stephen Berman <stephen.berman@gmx.net> writes:

 > On Sat, 15 Jul 2023 10:20:17 -0300 Mauro Aranda 
<maurooaranda@gmail.com> wrote:
 >
 >> Turns out this code introduces regressions when customizing faces.
 >>
 >> With emacs -Q:
 >> M-x customize-face RET default
 >> Action the State button and choose: "For All Kinds of Displays"
 >> Action the Display menu and select "specific display"
 >> Wrong type argument: number-or-marker-p, "        "
 >>
 >> The substitute-command-keys operation is too destructive, and messes
 >> with things it shouldn't be modifying, like the :offset property of
 >> widgets in this case.

 > Sorry for not responding sooner; I was travelling and only now had time
 > to look into this.  If I debugged it correctly, the problem is that the
 > value of :extra-offset, 9, satisfies char-or-string-p, so then due to my
 > patch substitute-command-keys turns it into a string containing a TAB.

No trouble at all.  And yes, that sounds correct to me.

 > The cases intended to be fixed by my patch are where strings with grave
 > quoting occur, which should be turned into strings with curve quoting.
 > If so, then testing for stringp suffices, and the attached patch avoids
 > the regression you found and gives the desired results for the other
 > cases discussed in this bug.  I don't know why I used char-or-string-p
 > instead of stringp in my original patch, and don't see a reason for it
 > now.  Or do you know of cases where testing for stringp is insufficient?

I don't know, but I feel like stringp should suffice.  So please install
your fix, and I will be alert if something else breaks.