QTableView + SelectRows dragging with CTRL key

With a QTableView set to use SelectionBehavior(QAbstractItemView::SelectRows) and SelectionMode(QAbstractItemView::ExtendedSelection) the CTRL select does not seem to function correctly.

Dragging the mouse together with the CTRL key on the viewport toggles the
selection of the rows - like expected.

Doing the same on the row headers on the left of the widget leads to different ( pointless ) selections.

This can be seen with the following sample code:

#include <QtGui>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QTableWidget tableWidget(5,5);
tableWidget.setSelectionBehavior(QAbstractItemView::SelectRows);
tableWidget.setSelectionMode(QAbstractItemView::ExtendedSelection);
tableWidget.show();
return app.exec();
}