remove xdg-desktop-portal-gtk service; xdg-desktop-portal knows how to start that itself

hosts/common/programs/default.nix

@@ -92,7 +92,6 @@
     ./wob.nix
     ./xarchiver.nix
     ./xdg-desktop-portal.nix
-    ./xdg-desktop-portal-gtk.nix
     ./xdg-utils.nix
     ./zeal.nix
     ./zecwallet-lite.nix

hosts/common/programs/xdg-desktop-portal-gtk.nix

@@ -1,24 +0,0 @@
-{ config, ... }:
-let
-  cfg = config.sane.programs.xdg-desktop-portal-gtk;
-in
-{
-  sane.programs.xdg-desktop-portal-gtk = {
-    # the portal handles things like file/app open requests, so it needs access to everything
-    # any installed app might require.
-    sandbox.enable = false;
-
-    services.xdg-desktop-portal-gtk = {
-      # xdg-desktop-portal-gtk provides the service/dbus file, but doesn't link the right `wantedBy`
-      # so have to recreate it here :(
-      description = "Portal service (GTK/GNOME implementation)";
-      wantedBy = [ "xdg-desktop-portal.service" ];
-      before = [ "xdg-desktop-portal.service" ];
-      serviceConfig = {
-        ExecStart = "${cfg.package}/libexec/xdg-desktop-portal-gtk";
-        Type = "dbus";
-        BusName = "org.freedesktop.impl.portal.desktop.gtk";
-      };
-    };
-  };
-}

hosts/common/programs/xdg-desktop-portal.nix

@@ -14,8 +14,9 @@ in
         BusName = "org.freedesktop.portal.Desktop";
       };
 
-      # xdg-desktop-portal needs to know where to find xdg-desktop-portal-gtk, etc, for some reason (???).
-      # otherwise, it won't expose stuff like the OpenURI endpoint, even if a suitable AppChooser is available on dbus.
+      # xdg-desktop-portal expects to act as a strict frontend and manage xdg-desktop-portal-{gtk,wlr,etc} itself,
+      # which means it needs to know how which endpoints each backend provides and how to launch it,
+      # encoded in /share/xdg-desktop-portal/portals:
       environment.XDG_DESKTOP_PORTAL_DIR = "/etc/profiles/per-user/%u/share/xdg-desktop-portal/portals";
     };
   };