bug#46243: 26.3; If invoke menu item that reads a char, get keystrokes echo

[Eli Zaretskii]

> From: Drew Adams <drew.adams@oracle.com>
> Date: Mon, 1 Feb 2021 18:50:56 +0000
> 
> If I have a menu item that reads a character, the prompt for that read
> is not seen; the menu selection key sequence gets echoed instead.  This
> shouldn't happen (should it?).

I think it should, but I couldn't verify that, because your recipes
didn't work for me.  Please provide a recipe that would work in
"emacs -Q".