xmonad: variable pour java et trayer

public/xmonad/xmonad.nix

@@ -13,6 +13,7 @@ mkIf cfg.xmonad {
   environment.systemPackages = with pkgs; [
     dmenu
     haskellPackages.xmobar
+    trayer
   ];
 
   # Services
@@ -23,4 +24,7 @@ mkIf cfg.xmonad {
       haskellPackages.xmobar
     ];
   };
+  environment.variables = {
+    _JAVA_AWT_WM_NONREPARENTING = "1";
+  };
 }