example: conf: use foreign-toplevel instead of i3’s ‘current’

examples/configurations/laptop.conf

@@ -105,23 +105,17 @@ bar:
                 unfocused: {string: {<<: *music}}
                 invisible: {string: {<<: [*music, *invisible]}}
                 urgent:    {string: {<<: [*music, *urgent]}}
-          current:
-            map:
-              left-margin: 7
-              tag: application
-              values:
-                "":
-                  - map: {<<: *i3_mode}
-                  - string: {text: "{title}"}
-              default:
-                list:
-                  spacing: 0
-                  items:
-                    - map: {<<: *i3_mode}
-                    - string: {text: "{application}", max: 10, foreground: ffa0a0ff}
-                    - string: {text: ": "}
-                    - string: {text: "{title}", max: 35}
 
+    - foreign-toplevel:
+        content:
+          map:
+            tag: activated
+            values:
+              false: {empty: {}}
+              true:
+                - string: {text: "{app-id}", foreground: ffa0a0ff}
+                - string: {text: ": "}
+                - string: {text: "{title}"}
   center:
     - mpd:
         host: /run/mpd/socket