title: How to close/kill app on Flutter
body: <p>I am actually aware of this implementation: <a href="https://stackoverflow.com/questions/45109557/flutter-programmatically-closing-the-app">Flutter programmatically closing the app</a>, but when the app closes is still in background. How can I absolutely kill the app and not let it be in background?</p>
  
  <p>Thank you!</p>