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,  rgm@gnu.org,  50752@debbugs.gnu.org,  
> shuguang79@qq.com
> Date: Mon, 25 Oct 2021 15:55:03 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Can we come up with a much simpler and safer variant that could
> > perhaps solve 85% of the problem? like perhaps only the letter-case,
> > and disregarding the Turkish issue somehow?  Then I could agree to
> > have that on the release branch.
> 
> Sure, I think that's what Stefan went for at the start (and which I was
> thinking of, too), but it sounded like you wanted this to be more
> ambitious.
> 
> I think just downcasing ASCII would get use more than 99%, really.

Then let's go with this variant on emacs-28, and leave the full
solution for master.