[TD]fix Balloon placement issues

- contributed by @lidiriel

src/Mod/TechDraw/Gui/QGIView.cpp

@@ -247,6 +247,7 @@ void QGIView::mouseReleaseEvent(QGraphicsSceneMouseEvent * event)
     //TODO: this should be done in itemChange - item position has changed
     //TODO: and should check for dragging
 //    Base::Console().Message("QGIV::mouseReleaseEvent() - %s\n",getViewName());
+//    if(scene() && this == scene()->mouseGrabberItem()) {
     if(!m_locked) {
         if (!isInnerView()) {
             double tempX = x(),