I've been having this problem: How move window to left/right workspace irritate me, ever since starting to use Ubuntu 18.04 with Gnome (I also ended up having to use gnome-shell-extension "Workspace Grid") - so I tried looking a bit more into it.
I've found that, basically, all shortcuts with Ctrl+Shift+Alt are ignored; for instance, here is dconf-editor showing the WM keybindings:
Here, if I press Ctrl+Shift+Alt+Down nothing happens, however Super+Shift+Page Down works. I tried some other shortcuts, and it seems, for instance, Ctrl+Alt shortcuts work.
Also, Ctrl+Shift+Alt+Left (which should be move-to-workspace-left) seems to do the same as Ctrl+Alt+Left (switch-to-workspace-left), so it seems that specifically Shift is ignored when also Ctrl and Alt are pressed ?!
So, my questions are:
Why does this happen? Is it some policy in Gnome3 that prohibits Ctrl+Shift+Alt, and if so, why? If not, could this be a conflict with some other software (maybe the "Workspace Grid" extension itself)?
How could I find out what, if anything, is consuming Ctrl+Shift+Alt keyboard shortcuts?
For the second issue, I've seen Where does Ubuntu store its keyboard shortcut configuration? - and trying xev; it seems xev can register (slow, consecutive) presses (and holds) of Ctrl, then Shift, then Alt - and also then key Left - which means the wm ignored Ctrl+Shift+Alt+Left completely?!
Is there any other application (terminal or GUI), where I could press a keyboard shortcut, and it tells me what in the system interprets that shortcut?
