The value returned by QKeyEvent::key() for keys that need the shift key changed between Qt 5.0.2 and Qt 5.1.0.

On german keyboard the double quote (") character needs the shift key (Shift+2).

Qt 5.0.2
QKeyEvent contained the values key = 34 (Qt::Key_QuoteDbl), modifiers = Qt::ShiftModifier and text = ".

Qt 5.1.0
QKeyEvent now contains the values key = 50 (Qt::Key_2), modifiers = Qt::ShiftModifier and text = ".

Qt 5.1.1 (MinGW 4.8)
QKeyEvent now contains the values key = 50 (Qt::Key_2), modifiers = Qt::ShiftModifier and text = ".