Refactor start/endComputation into lazyRedraw method

js/forum/src/components/DiscussionList.js

@@ -179,12 +179,7 @@ export default class DiscussionList extends Component {
     this.loading = false;
     this.moreResults = !!results.payload.links.next;
 
-    // Since this may be called during the component's constructor, i.e. in the
-    // middle of a redraw, forcing another redraw would not bode well. Instead
-    // we start/end a computation so Mithril will only redraw if it isn't
-    // already doing so.
-    m.startComputation();
-    m.endComputation();
+    m.lazyRedraw();
 
     return results;
   }

js/forum/src/components/DiscussionPage.js

@@ -149,12 +149,7 @@ export default class DiscussionPage extends mixin(Component, evented) {
         .then(this.init.bind(this));
     }
 
-    // Since this may be called during the component's constructor, i.e. in the
-    // middle of a redraw, forcing another redraw would not bode well. Instead
-    // we start/end a computation so Mithril will only redraw if it isn't
-    // already doing so.
-    m.startComputation();
-    m.endComputation();
+    m.lazyRedraw();
   }
 
   /**

js/forum/src/components/PostsUserPage.js

@@ -95,9 +95,7 @@ export default class PostsUserPage extends UserPage {
     this.loading = true;
     this.posts = [];
 
-    // Redraw, but only if we're not in the middle of a route change.
-    m.startComputation();
-    m.endComputation();
+    m.lazyRedraw();
 
     this.loadResults().then(this.parseResults.bind(this));
   }

js/lib/components/ModalManager.js

@@ -81,7 +81,7 @@ export default class ModalManager extends Component {
   clear() {
     this.component = null;
 
-    m.redraw();
+    m.lazyRedraw();
   }
 
   /**

js/lib/utils/patchMithril.js

@@ -13,5 +13,15 @@ export default function patchMithril(global) {
 
   Object.keys(mo).forEach(key => m[key] = mo[key]);
 
+  /**
+   * Redraw only if not in the middle of a computation (e.g. a route change).
+   *
+   * @return {void}
+   */
+  m.lazyRedraw = function() {
+    m.startComputation();
+    m.endComputation();
+  };
+
   global.m = m;
 }