title: QLineWidget returnPressed signal not working
body: <p>I have a <code>QLineWidget</code> inside of <code>QWidget</code> that is a tab (<code>QTabWidget</code> 'page'), I'm trying to use the <code>returnPressed</code> signal, but it isn't working, it was working before but i completely changed the code structure and it's not anymore.</p>
  
  <p>The application outputs <code>QMetaObject::connectSlotsByName: No matching signal for on_urlEntry_returnPressed()</code></p>
  
  <p>Widget class header: <a href="http://pastebin.com/GbMNmjUD" rel="nofollow">http://pastebin.com/GbMNmjUD</a><br>
  Widget class source: <a href="http://pastebin.com/chdkhBRy" rel="nofollow">http://pastebin.com/chdkhBRy</a></p>