gtk/print.go
func (ps *PaperSize) GetDefaultLeftMargin(unit Unit) float64 {
	c := C.gtk_paper_size_get_default_left_margin(ps.native(), C.GtkUnit(unit))
	return float64(c)
}
func (ps *PaperSize) GetDefaultLeftMargin(unit Unit) float64 {
	c := C.gtk_paper_size_get_default_left_margin(ps.native(), C.GtkUnit(unit))
	return float64(c)
}
// GetDefaultLeftMargin() is a wrapper around gtk_paper_size_get_default_left_margin().