REG: QMenu::exec() regression

The following has changed in 4.7 compared to previous versions:

The following code:

QMenu popupMenu(0);
popupMenu.addAction("Some action");
popupMenu.exec(QCursor::pos());

causes the active window to deactivate. This was not the case in 4.6
To behave like 4.6, one has to do:

QMenu popupMenu(someParentWidget); // watch
popupMenu.addAction("Some action");
popupMenu.exec(QCursor::pos());

Why not, but if this is normal now, I think that the parent argument of the QMenu ctor should not be 0 any more, because that leads to a non-desirable effect.

Here's a small application that reproduces what I have described here.
This was tested under Windows with 4.7b1.

<<<<<<<<<<<<<<<<<

#include <QtGui/QtGui>

class TWidget : public QWidget
{
public:
TWidget(QWidget* parent) : QWidget(parent) {}
void mousePressEvent(QMouseEvent* ev);
};

void TWidget::mousePressEvent(QMouseEvent* ev)
{
if (ev->button() == Qt::RightButton)

{ QMenu popupMenu(0); popupMenu.addAction("Some action"); popupMenu.exec(QCursor::pos()); }

}

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QMainWindow w;

TWidget* le = new TWidget(&w);
w.setCentralWidget(le);
w.show();

return a.exec();
}