message: Destructured previous scene
diff: @@ -28,9 +28,9 @@ class NavigationMotion extends React.Component<NavigationMotionProps, Navigation
  static defaultProps = {
  duration: 300
  }
  - static getDerivedStateFromProps({stateNavigator}, prevState) {
  + static getDerivedStateFromProps({stateNavigator}, {scene: prevScene}) {
  var scene = stateNavigator.stateContext.crumbs.length;
  - return prevState.scene !== scene ? {scene, rest: false} : null;
  + return prevScene !== scene ? {scene, rest: false} : null;
  }
  getSharedElements(crumbs, oldUrl) {
  if (oldUrl === null || crumbs.length === oldUrl.split('crumb=').length - 1)
  