Retrive the literal adjustment value for GtkRange based
widgets and spin buttons. Note that the value returned by
this function is anything between the lower and upper bounds
of the adjustment belonging to widget, and is not a percentage
as passed in to gtk.global.testSliderSetPerc.
Retrive the literal adjustment value for GtkRange based widgets and spin buttons. Note that the value returned by this function is anything between the lower and upper bounds of the adjustment belonging to widget, and is not a percentage as passed in to gtk.global.testSliderSetPerc.