title: QGraphicsItem and hover event
body: <p>I have reimplemented the hoverEnterEvent but for some reason it is not called :-(
  My method is very simple at this point:</p>
  
  <pre><code>void LinteItem::hoverEnterEvent(QGraphicsSceneHoverEvent * event) {
  
      qDebug("Mouse hovered");
      QGraphicsItem::hoverEnterEvent(event);
  }
  </code></pre>
  
  <p>I have set mouseTracking on the view. I'm able to place new LinteItems using mouseMove etc so I know the tracking works.</p>
  
  <p>I have the following in the constructor:</p>
  
  <pre><code>setFlags(QGraphicsItem::ItemIsSelectable |
               QGraphicsItem::ItemIsMovable |
               QGraphicsItem::ItemSendsGeometryChanges);     
  setAcceptHoverEvents(true);
  </code></pre>
  
  <p>Any idea why I do not receive the events?
  I'm using Qt 5.5 btw</p>