gtk/widget.go
func (v *Widget) GetPreferredHeight() (int, int) {
	var minimum, natural C.gint
	C.gtk_widget_get_preferred_height(v.native(), &minimum, &natural)
	return int(minimum), int(natural)
}
func (v *Widget) GetPreferredHeight() (int, int) {
	var minimum, natural C.gint
	C.gtk_widget_get_preferred_height(v.native(), &minimum, &natural)
	return int(minimum), int(natural)
}
// GetPreferredHeight is a wrapper around gtk_widget_get_preferred_height().