title: Remove padding from ListTile between leading and title
body: <p>I need to remove some padding between leading Widget and title Widget in a ListTile.
  It has too much blank spaces.
  Is there a way to do that?
  The code that I am using for that is this:</p>
  
  <pre><code>ListTile _getActionMenu(String text, IconData icon, Function() onTap) {
    return new ListTile(
      leading: new Icon(icon),
      title: new Text(text),
      onTap: onTap,
    );
  }
  </code></pre>