For the key event e.g. "Alt+g" modifiers Qt::AltModifier *and* Qt::MetaModifier are set

I've attached a demo application showing the issue. It prints the relevant modifiers for each incoming key press event:

• Build and run
• Position mouse cursor on the window
• Hit "Alt+g". The output for Qt 5.1 Beta 1 (and at least up to sha1 a11c7ef) is:

virtual void MyWidget::keyPressEvent(QKeyEvent*) 
Qt::AltModifier 
virtual void MyWidget::keyPressEvent(QKeyEvent*) 
Qt::MetaModifier 
Qt::AltModifier 

The first call corresponds to pressing Alt, the second one to additionally pressing 'g'.

It works with Qt 5.0.2, e.g. the output for that is:

virtual void MyWidget::keyPressEvent(QKeyEvent*) 
Qt::AltModifier 
virtual void MyWidget::keyPressEvent(QKeyEvent*) 
Qt::AltModifier