title: QListWidget doesn't allow icon size greater than 200
body: <p><code>QListWidget::setIconSize</code> with size > 200x200 doesn't seem to have any effect. Is it intended, or am I doing something wrong? There's no mention of such cap in the doc. Could there be another property that's limiting icon size?</p>
  
  <p>I'm using Qt 5.</p>