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: Wed, 20 Oct 2021 09:45:44 +0200
> 
> I'm still seeing some oddities in the case stuff tr_TR.UTF-8.
> 
> If you have
> 
> india
> ındıa
> 
> in a (multibyte) buffer and hit `M-u M-u', I get
> 
> İNDİA
> INDIA
> 
> which is expected.  However, `M-c M-c' gets me
> 
> India
> Indıa
> 
> I tried googling whether dotted lower-case i should be upcased
> differently when capitalising, but I couldn't find anything...

Michal, could you perhaps help us out here?