title: Vertical Divider not showing
body: <p>I'm trying to use the <code>VerticalDivider</code> widget to separate items in the <code>Row</code>. <a href="https://gist.github.com/buraktabn/18b4468307f4de22ef6eec399c6f1231" rel="noreferrer">Here</a> is the whole body.</p>
  
  <p><a href="https://i.stack.imgur.com/tTj2l.png" rel="noreferrer"><img src="https://i.stack.imgur.com/tTj2l.png" alt="enter image description here"></a></p>
  
  <p><strong>Row:</strong></p>
  
  <pre class="lang-dart prettyprint-override"><code>Row(
    children: &lt;Widget&gt;[
      Text('420 Posts', style: TextStyle(color: Color(0xff666666)),),
      VerticalDivider(
        thickness: 2,
        width: 20,
        color: Colors.black,
      ),
      Text('420 Posts', style: TextStyle(color: Color(0xff666666)),)
    ],
  ),
  </code></pre>