valid GtkSpinButton widget.
Number of the pointer button for the event, usually 1, 2 or 3.
true for upwards arrow click, false for downwards arrow click.
whether all actions neccessary for the button click simulation were carried out successfully.
Deprecated: This testing infrastructure is phased out in favor of reftests.
This function will generate a button click in the upwards or downwards spin button arrow areas, usually leading to an increase or decrease of spin button’s value.