NixOS + GNOME: Launcher feature not working

[valyntyler]

Same as #56, but on gnome. Tried the solutions there and I can't get it to work.

[VTimofeenko]

What specifically is happening?

Please post the config you're using. Ideally as a self-contained nixosConfiguration, but xremap's config will suffice.

[valyntyler]

Please post the config you're using. Ideally as a self-contained nixosConfiguration, but xremap's config will suffice.
This is my nixos config. Will this suffice or should I pick out the relevant code?