title: Flutter: smooth drawer transition for closing while navigating to another page
body: <p>Using Flutter v.1.22.5, I integrated a navigation drawer to my app (needs to be added to every page that should contain it, right?). After tapping on of the ListTiles, I call Navigator.pushReplacementNamed() inside the ontap() handler to navigate to another page inside my app.</p>
  <pre><code>            ListTile(
                title: Text('FooPage'),
                onTap: () {
                  Navigator.pushReplacementNamed(context, '/foo'); //navigates to page and closes the drawer INSTANTLY
                },
              ),
  </code></pre>
  <p>The app then instantly navigates to the associated page but abruptly closes the navigation drawer - it instantly disappears without any smooth closing transition. Is this the normal behaviour of the Flutter navigation drawer or am I doing some silly mistake here? Isn't there any way to have the app navigate to the desired page in the background while smoothly closing the drawer?!</p>