the config environment.gnome3.excludePackages = [ 'pkgs.gnome3.geary ' ] can not work

[gemone]

Describe the bug
When use the config environment.gnome3.excludePackages = [ 'pkgs.gnome3.geary ' ], the program geary still exists in the system.

Notify maintainers

@jtojnar @infinisil Sorry to disturb.

Additional context

Just use:

   environment.gnome3 = {  
       excludePackages = [ 
           pkgs.epiphany 
           pkgs.gnome3.geary 
           pkgs.gnome3.gnome-maps 
           pkgs.gnome3.gnome-software 
       ]; 
   };

BUT it can not delete the package geary.

If I use programs.geary.enable = false;, the package geary will be delete. I check my config, and I did not find which add the geary. Is the Command Conflict?

Metadata

Maintainer information:

 - system: `"x86_64-linux"`
 - host os: `Linux 5.4.62, NixOS, 20.03.2913.4bd1938e03e (Markhor)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.3.6`
 - channels(root): `"nixos-20.03"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

[jtojnar]

Right, this is expected.

We have a PR that will document this behaviour but it has not been merged yet:

https://github.com/NixOS/nixpkgs/blob/e70e481a54f4327d32a3ecf8c61f6bc96d9d5ac5/nixos/modules/services/x11/desktop-managers/gnome3.xml#L56-L61

[gemone]

Right, this is expected.

We have a PR that will document this behaviour but it has not been merged yet:

https://github.com/NixOS/nixpkgs/blob/e70e481a54f4327d32a3ecf8c61f6bc96d9d5ac5/nixos/modules/services/x11/desktop-managers/gnome3.xml#L56-L61

Thanks, I got it.