Here its also called `Super-L` (and `Super_R`) by itself, but I can't set it by itself as its stolen by the Cinnamon desktop to show its menu.
Also `Ctrl_L` (and `Ctrl_R`) can be set by themselves (and work).
But the combination `<Primary>Super_L/R` can be set but does not work, nor does it do anything in the desktop, but maybe its still being stolen by it.
But the OP is getting `<primary><super>` which is two modifiers, @philiprbrenan @eht16 whats your Geany and GTK and OS and desktop version information?
Here is Cinnamon desktop and ``` 11:12:18: Geany INFO : Geany 1.38 (git >= b524a58e), en_AU.UTF-8 11:12:18: Geany INFO : GTK 3.24.20, GLib 2.64.6 11:12:18: Geany INFO : OS: Linux Mint 20 (ulyana) ```