I updated my desktop to this snapshot yesterday.
Now the key composing in emacs-x11 does not work anymore.
(I use "keysym Menu = Multi_key" in .Xmodmap so that I can, e.g., type
<Menu> " a to get an a-umlaut, ä).
The mechanism itself does still work in other applications (terminals, vivaldi
browser), and also when running "emacs -nw" in an xterm.
If I hit <Menu> in the X version of emacs, I immediately get a notification in
the info line "