super key no longer reported to X11 apps / shortcut inhibition no longer works for the super key
I noticed this at first with a VirtualBox virtual machine (vm) running F29 + GNOME3 on a Fedora 31 host with mutter + gnome-shell build from master.
I've VirtualBox on the list of apps which are allowed to use shortcut inhibition and e.g. alt+tab correctly goes to the vm rather then to the host UI.
But if I press super and release it again, I get the host UI overview rather then the overview in the vm.
Testing some more shortcuts I noticed that pressing super+l gives me just a 'l' inside the terminal in the vm.
I then tested with xev running on the host, and e.g. super+g which is not bound to anything causes xev to only see the 'g' press and release. Which means that for X11 apps at least any super+unreserved-key combi now no longer works / is seen as just unreserved-key.