Refactor start/endComputation into lazyRedraw method

framework/core/js/lib/components/ModalManager.js

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

framework/core/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;
 }