xsession.pointerCursor: .icons file for AwesomeWM (#2084)

modules/xcursor.nix

@@ -79,5 +79,14 @@ in {
       "gtk-cursor-theme-size" = cfg.size;
     };
 
+    # Set name in icons theme, for compatibility with AwesomeWM etc. See:
+    # https://github.com/nix-community/home-manager/issues/2081
+    # https://wiki.archlinux.org/title/Cursor_themes#XDG_specification
+    home.file.".icons/default/index.theme".text = ''
+      [icon theme]
+      Name=Default
+      Comment=Default Cursor Theme
+      Inherits=${cfg.name}
+    '';
   };
 }