I use Caps Lock to change keyboard input language. After upgrade to 17.10 with gnome-shell v.3.26.2-0ubuntu0.1 a popup thingie shows up in the center of the screen with available layouts to choose everytime I press Caps Lock.
But that annoying thing is taking up input focus and turns off after a couple seconds only. Not linked with input method key setting at all, i.e. I can change layout with another Alt+Shift combo and that thing doesn't show up.
UPD: That thing only shows up on single-key switch modifier (i.e. CapsLock). If I press Alt+CapsLock for example (combo not assigned to anything) - it doesn't show.
Anyone knows what is that and how do I disable that?