bug#50752: 28.0.50; easy-menu-define lowers the menu-bar key

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: stefan@marxist.se,  shuguang79@qq.com,  50752@debbugs.gnu.org
> Date: Tue, 19 Oct 2021 17:57:09 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I'd actually prefer to ignore any locale-specific behavior that take
> > an ASCII character and downcases (or upcases) it to a non-ASCII one,
> > in the unibyte case.  IOW, if changing a case of an ASCII character
> > from a unibyte string produces a non-ASCII multibyte character,
> > disregard any locale-specific case-conversion and use US ASCII rules.
> > That at least has the chance of not adversely affecting anything,
> > whereas producing non-ASCII multibyte string instead is IMO much
> > worse.
> 
> For the vast majority of cases, that would indeed produce the result
> that's probably expected.  (I mean, somebody doing (downcase "LATIN-1")
> in code doesn't want the locale, anyway.)
> 
> But it means that downcasing a string in a buffer and saying (downcase
> "THAT SAME STRING") gives us different results.

If the buffer is unibyte, the results will be the same.

> But perhaps that's the least bad solution?

I think so, yes.  _If_ we are going to change the current behavior,
that is.