title: Add border to a Container with borderRadius in Flutter
body: <pre><code>Container(
        child: Text(
            'This is a Container',
            textScaleFactor: 2,
            style: TextStyle(color: Colors.black),
        ),
  
        decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(10),
            color: Colors.white,
            border: Border(
                left: BorderSide(
                    color: Colors.green,
                    width: 3,
                ),
              ),
            ),
        height: 50,
       ),
  </code></pre>
  
  <p>This is supposed to show a rounded-edged container with a green left border 3px wide, and the child Text "This is a Container". However, it just shows a rounded-edged container with an invisible child and an invisible left border.</p>
  
  <p>When I take out the borderRadius object, the child Text and the green left border is visible, but introducing it hides the left border and child Text again. </p>
  
  <p>The major problem seems to be the custom left border, because using <code>border: Border.all(width: 0)</code> and <code>borderRadius: BorderRadius.circular(10)</code> makes the edges rounded as needed and also shows the child. But now I cant apply the green left border which is quite important in this particular setup.</p>
  
  <p>So is there something I'm doing wrong, or is this a bug in flutter, or is it just something that is not allowed?</p>
  
  <p>Thank you in advance.</p>
  
  <p>Edit: The image below is the end result. The colors don't matter</p>
  
  <p><a href="https://i.stack.imgur.com/GSCry.png" rel="noreferrer"><img src="https://i.stack.imgur.com/GSCry.png" alt="This is how it should look"></a></p>