title: Flutter BottomNavigationBar center icon style
body: <p>Is there a way to add a notch above the center icon in <code>BottomNavigationBar</code>? Something like in this image: </p>
  
  <p><a href="https://i.stack.imgur.com/4vhHq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4vhHq.png" alt="sc"></a></p>
  
  <p>I currently have something like this generating the navigation: </p>
  
  <pre><code>        return BottomNavigationBar(
            type: BottomNavigationBarType.fixed,
            fixedColor: Color(0xff2398C3),
            showSelectedLabels: false,
            showUnselectedLabels: false,
            currentIndex: snapshot.data.index,
            onTap: _bottomNavBarBloc.pickItem,
            items: [
              BottomNavigationBarItem(
                title: Text('Search'),
                icon: Icon(Icons.search),
              ),
              BottomNavigationBarItem(
                title: Text('Browse'),
                icon: Icon(Icons.view_list),
              ),
              BottomNavigationBarItem(
                title: Text('Icon'),
                icon: Container(
                  child: FlutterLogo(
                    size: 35.0,
                  ),
                ),
              ),
              BottomNavigationBarItem(
                title: Text('Favorites'),
                icon: Icon(Icons.bookmark),
              ),
              BottomNavigationBarItem(
                title: Text('Settings'),
                icon: Icon(Icons.settings),
              ),
            ],
          );
  </code></pre>