gtk/print.go
func (ps *PaperSize) SetSize(width, height float64, unit Unit) {
	C.gtk_paper_size_set_size(ps.native(), C.gdouble(width), C.gdouble(height), C.GtkUnit(unit))
}
func (ps *PaperSize) SetSize(width, height float64, unit Unit) {
	C.gtk_paper_size_set_size(ps.native(), C.gdouble(width), C.gdouble(height), C.GtkUnit(unit))
}
// SetSize() is a wrapper around gtk_paper_size_set_size().