Change the way composer is aligned

Also ensure that the correct body class is applied on the user page

js/forum/src/components/ActivityPage.js

@@ -89,7 +89,9 @@ export default class ActivityPage extends UserPage {
     this.loading = true;
     this.activity = [];
 
-    m.redraw();
+    // Redraw, but only if we're not in the middle of a route change.
+    m.startComputation();
+    m.endComputation();
 
     this.loadResults().then(this.parseResults.bind(this));
   }