Disable capSysNice for gamescope to fix an issues launching games

Add gamescope args for Vanguard

Inhibit idle when gamescope is running

system/Vanguard.nix

@@ -51,6 +51,16 @@
       ];
     })
   ];
+  programs.gamescope.args = [
+    "-W 2540"
+    "-H 1440"
+    "-r 120"
+    "-F fsr"
+    "--fullscreen"
+    "--adaptive-sync"
+    "--mangoapp"
+    "-e"
+  ];
   services.hardware.openrgb.enable = true;
   networking.wg-quick.interfaces.wg0.configFile = "/etc/wireguard/gb-mnc-wg-001.conf";
   system.stateVersion = "23.05";

system/home/hyprland.nix

@@ -295,7 +295,7 @@
         "idleinhibit fullscreen, class:firefox|com.github.rafostar.Clapper"
 
         # Inhibit idle when playing games
-        "idleinhibit always, class:(steam_app|Minecraft).*"
+        "idleinhibit always, class:(steam_app|gamescope|Minecraft).*"
 
         # LibreOffice
         "suppressevent fullscreen maximize, class:(libreoffice|soffice)(.*)"

system/steam.nix

@@ -10,7 +10,7 @@
     };
     gamescope = {
       enable = true;
-      capSysNice = true;
+      capSysNice = false; # Currently a bug with starting Steam games
     };
   };
   home-manager.users.${username}.programs.mangohud = {