title: CircleAvatar flutter not fit the image inside the circle
body: <p><a href="https://i.stack.imgur.com/T2DNJ.png" rel="nofollow noreferrer"></a></p>
  
  <p>please help, i need to put an image inside <code>circleAvatar</code> widget, but the image doesn't show perfectly.</p>
  
  <p>this issue, only shown on android devices</p>
  
  <p><img src="https://i.stack.imgur.com/T2DNJ.png" alt="enter image description here"></p>
  
  <pre><code>                     return Center(
                          child: CircleAvatar(
                            radius: 100.0,
                            backgroundImage: ExactAssetImage(
                              'assets/images/ic_Photo-L.png',
                            ),
                          ),
                        );
  </code></pre>