qpushbutton: pressed signal not emitted until button is released, unsing touchscreen as input

While using a touchscreen as HID-device, the qpushbutton sends the pressed signal not until the touch input has ended. It is then emitted together with the released signal, thus creating a clicked signal for every touch interaction with the pushbutton.

Same Interaction was tested with Qt 5.0.2, where it worked as expected. Pressed signal when button is touched. Released signal when touch input ends.