message: Tested crumb is unfrozen when returning
  Fired the set state when frozen and check it's rendered when navigating back to it
diff: @@ -1029,4 +1029,44 @@ describe('NavigationMotion', function () {
  }
  })
  });
  +
  + describe('Crumb set state navigate back', function () {
  + it('should render', function(){
  + var stateNavigator = new StateNavigator([
  + { key: 'sceneA' },
  + { key: 'sceneB', trackCrumbTrail: true },
  + ]);
  + stateNavigator.navigate('sceneA');
  + var {sceneA, sceneB} = stateNavigator.states;
  + var update;
  + var SceneA = () => {
  + var [updated, setUpdated] = useState(false)
  + update = setUpdated;
  + return <div id='sceneA' data-updated={updated} />;
  + };
  + var SceneB = () => <div id="sceneB" />;
  + sceneA.renderScene = () => <SceneA />;
  + sceneB.renderScene = () => <SceneB />;
  + var container = document.createElement('div');
  + ReactDOM.render(
  + <NavigationHandler stateNavigator={stateNavigator}>
  + <NavigationMotion>
  + {(_style, scene, key) => (
  + <div className="scene" id={key} key={key}>{scene}</div>
  + )}
  + </NavigationMotion>
  + </NavigationHandler>,
  + container
  + );
  + stateNavigator.navigate('sceneB');
  + update(true);
  + stateNavigator.navigateBack(1);
  + try {
  + var scene = container.querySelector<HTMLDivElement>("#sceneA");
  + assert.strictEqual(scene.dataset.updated, 'true');
  + } finally {
  + ReactDOM.unmountComponentAtNode(container);
  + }
  + })
  + });
  });
  