func (v *TextView) SetLeftMargin(margin int) {
	C.gtk_text_view_set_left_margin(v.native(), C.gint(margin))
}
func (v *TextView) SetLeftMargin(margin int) {
	C.gtk_text_view_set_left_margin(v.native(), C.gint(margin))
}
// SetLeftMargin is a wrapper around gtk_text_view_set_left_margin().