bug#64652: 28.2; Adding a property bug on Windows 11

[Eli Zaretskii]

> From: Ihor Radchenko <yantar92@posteo.net>
> Cc: senkijun@gmail.com, ruijie@netyu.xyz, 64652@debbugs.gnu.org
> Date: Sun, 16 Jul 2023 09:21:50 +0000
> 
> Ihor Radchenko <yantar92@posteo.net> writes:
> 
> > Eli Zaretskii <eliz@gnu.org> writes:
> >
> >> Btw, where the pattern includes only upper-case letters, a possibly
> >> cheaper solution is to bind case-fold-search to nil instead.
> >
> > Sure, but it is not possible, unfortunately. Org uses case-insensitive
> > keywords.
> 
> Hmm... One way could be modifying regexps to something like
> [Pp][Rr][Oo][Pp][Ee][Rr][Tt][Ii][Ee][Ss]. May Emacs provide something
> like (regexp-case-quote REGEXP &optional CASE-TABLE)?

What would regexp-case-quote do with REGEXP?

Regarding [Pp][Rr] etc.: does this have any significant effect on
performance, due to use of character classes?