const KUrl::List urls = KUrl::List::fromMimeData(event->mimeData());
if (urls.isEmpty() || (event->source() == this)) {
QTreeView::dropEvent(event);
const KUrl::List urls = KUrl::List::fromMimeData(event->mimeData());
if (urls.isEmpty() || (event->source() == this)) {
QTreeView::dropEvent(event);