GTK apps run from emacs daemon do not have KDE style

[tobiasBora]

Issue description

On my KDE desktop, I configured a dark theme for GTK apps. I also run emacs daemon by using the services.emacs.enable = true; option in configuration.nix, and then connects to it with emacseditor. However, it appears that if I run okular from emacs, using either M-! okular, M-x shell <RET> okular, or from a LaTeX mode, okular has an ugly theme. However, if I run it from a non-daemon emacs instance, it works great, so I guess that the emacs system service does not configure properly the environment variables for KDE.

Technical details

• system: "x86_64-linux"
• host os: Linux 4.14.75, NixOS, 19.03pre155123.32bcd72bf28 (Koi)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.1.3
• channels(leo): ""
• channels(root): "nixos-19.03pre155123.32bcd72bf28"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos

[oxij]

This behaviors would be hard to change without duplicating KDE environment setting in emacs systemd user service. Since plasma5 NixOS module does almost none of that environment magic I imagine most of it is done by Plasma itself.

Which means that if you want it, you would have to either "reverse-engineer" those environment computations and add them to emacs module (which, I imagine, would be very ugly; also, you would have to repeat that each time you change anything in KDE UI settings), or you can just start emacs --daemon from under KDE session instead of running it from systemd.

I suggest doing the latter and closing this.

[tobiasBora]

Makes sense, thank you for your comment.