gtk/icon_view.go
func (v *IconView) SetColumns(columns int) {
	C.gtk_icon_view_set_columns(v.native(), C.gint(columns))
}
func (v *IconView) SetColumns(columns int) {
	C.gtk_icon_view_set_columns(v.native(), C.gint(columns))
}
// SetColumns is a wrapper around gtk_icon_view_set_columns().