In QLineEdit there is an property modified which is set by QT, when the user changes the text of the widget.
Is there something like this for an QAbstractSpinBox?
When I'm trying to implement it on my own (with a derived class from QDoubleSpinBox) I can not be sure to reset the flag, because QDoubleSpinBox::setValue(double) isn't virtual. The signal valueChanged is emitted, when the user changes the value but also when it is changed by setValue or something. So I have no idea how to determine a programatly reset of the value.
