title: react-native-navigation how to detect current screen inside `shouldComponentUpdate`
body: <p>I'm using react-native-navigation and using redux for state management. when I go to screenA to screenB with "push" method and the screenA won't unmount. this will cause unwanted rerenders and previously in react-navigation I used shouldComponentUpdate to match component with the currently visible screen to stop re-render.</p>
  
  <p>Is there a way to do this in react-native-navigation?</p>