Mouse click events for a QTreeView inside of QComboBox not handled correctly

 
int main(int argc, char **argv)
{
    QApplication app(argc,argv);

    QStandardItemModel *model = new QStandardItemModel();
    QModelIndex parentItem;
    for (int i = 0; i < 4; ++i)
    {
        parentItem = model->index(0, 0, parentItem);
        model->insertRows(0, 1, parentItem);
        model->insertColumns(0, 1, parentItem);
        QModelIndex index = model->index(0, 0, parentItem);
        model->setData(index, QString("%1) Some random text to use as data ...").arg(i) );
    }

    QTreeView* view = new QTreeView();
    view->setSelectionMode(QAbstractItemView::SingleSelection);
    view->setModel(model);
    QComboBox combo;
    combo.setModel(model);
    combo.setView(view);
    combo.show();
    app.exec();
}