QDrag conflict with hover of widgets

#include <QApplication>
#include <QMainWindow>
#include <QTreeWidget>
#include <QVBoxLayout>
#include <QLineEdit>

class MainWindow : public QMainWindow
{
public:
    explicit MainWindow(QWidget* parent = 0)
    {
        QVBoxLayout* Layout = new QVBoxLayout;
        QTreeWidget* TreeWidget = new QTreeWidget;
        TreeWidget->setDragDropMode(QAbstractItemView::InternalMove);
        QTreeWidgetItem* TreeWidgetItem = new QTreeWidgetItem(TreeWidget);
        TreeWidgetItem->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsDragEnabled | Qt::ItemIsEditable);
        TreeWidgetItem->setText(0, "Test");
        Layout->addWidget(new QLineEdit);
        Layout->addWidget(TreeWidget);
        QWidget* LayoutWidget = new QWidget;
        LayoutWidget->setLayout(Layout);
        setCentralWidget(LayoutWidget);
        setFocus();
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    a.setStyleSheet("QWidget:item:hover{background-color: lightblue;color: black;}"
                    "QLineEdit:hover{border: 1px solid red;}");
    MainWindow w;
    w.show();
    return a.exec();
}