message: Prevented render if context unchanged
diff: @@ -5,7 +5,8 @@ import { SceneProps } from './Props';
  class Scene extends React.Component<SceneProps> {
  shouldComponentUpdate({navigationEvent, stateNavigator}: SceneProps) {
  var index = navigationEvent.stateNavigator.stateContext.crumbs.length;
  - return stateNavigator.stateContext.crumbs.length === index;
  + return stateNavigator.stateContext.crumbs.length === index
  + && navigationEvent !== this.props.navigationEvent;
  }
  render() {
  return (
  