title: Is there a way to keep fragment alive when using BottomNavigationView with new NavController?
body: <p>I'm trying to use the new navigation component. I use a BottomNavigationView with the navController : <code>NavigationUI.setupWithNavController(bottomNavigation, navController)</code></p>
  <p>But when I'm switching fragments, they are each time destroy/create even if they were previously used.</p>
  <p>Is there a way to keep alive our main fragments link to our BottomNavigationView?</p>