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

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> You mean, you want to special-case Turkish (and a couple of similar)
> locale?

Nope.  The loop can just check whether we get a multibyte result when
downcasing unibyte (ASCII), and then defer to the multibyte version to
do the computation.

This will basically only happen when using a Turkish (and a couple
similar) locales, though, so the general performance impact will be
approximately nil.

> And then we need to consider how many places don't expect to get
> multibyte string when they downcase a unibyte one.

That's a consideration, but I don't think we'll find out until we try.
(My guess is that nothing will be affected.)

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