bug#64046: 30.0.50; Quoting in customize choice tags

[Mauro Aranda <maurooaranda@gmail.com>]

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

 > 0. emacs -Q
 > 1. Evaluate the following defcustom:
 >    (defcustom my-test "a"
 >      "Test."
 >      :type '(choice (string :tag "Use `a'" "a")
 >                (string :tag "Use `b'" "b")))
 > 2. M-x customize-option RET my-test RET
 > 3. In the buffer *Customize Option: My Test* note that in the string
 >    "Use ‘a’" following the "Value Menu" button the quote marks are in
 >    the "curve" style (‘’).
 > 4. Put point on the "Value Menu" button and type RET.
 > 5. The buffer " widget-choose" contains these lines:
 >    0 = Use ‘a’
 >    1 = Use ‘b’
 >    Note that the quote marks in this buffer are also in the "curve"
 >    style.
 > 6. With the mouse pointer over the "Value Menu" button press mouse-1,
 >    popping up a menu titled "Choice" containing these items:
 >    Use `a'
 >    Use `b'
 >    Note that the quote marks in this menu are in the "grave" style (`')
 >    instead of the "curve" style.
 >
 > The use of the "curve" style in the " widget-choose" buffer is due to
 > commit bd3b426ebb7a60045839e97c9da9bfd249fab1f1, but that commit did not
 > take popup menus into account.  The attached patch does so. Since the
 > status quo ante long predates emacs-29 and this is just a stylistic bug,
 > I made the patch against master.
 >
 > In this patch I chose to apply substitute-command-keys just once at the
 > beginning of the function `widget-choose', rather than several times
 > within the function, but I restricted its application to item tags, so
 > other uses of the ITEMS argument should not be affected (and my brief
 > testing hasn't found any problem with the patch).

By moving the call to substitute-command-keys to the beginning, extended
menus simplified with widget--simplify-menu don't benefit anymore from
it.  Perhaps that won't ever show up as a problem, but I think we should
guard against that.

To do that, maybe widget--simplify-menu can call substitute-command-keys
when it builds the simplified menu.