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 20:21:42 +0200
> 
> > uniprop_table is somewhat expensive, and is definitely an overkill for
> > converting pure ASCII characters.  Why not just set/reset the 0x20
> > bit?
> 
> I thought it made sense to be conservative here and do it "properly",
> instead of open-coding an A-Za-z upcase/downcase ourselves.

Why is it a problem to do it ourselves?  It's a simple and very
efficient operation, and it will always be correct.

> And doesn't
> uniprop_table just return the table from char-code-property-alist here?
> So it's an assq from a short list.

It returns a char-table (so not really a short list), and it loads a
file when first called.  It isn't incorrect, just too heavy for such a
simple job.