pub trait GtkListStoreExtManual: 'static {
// Required methods
fn insert_with_values(
&self,
position: Option<u32>,
columns: &[u32],
values: &[&dyn ToValue],
) -> TreeIter;
fn reorder(&self, new_order: &[u32]);
fn set(&self, iter: &TreeIter, columns: &[u32], values: &[&dyn ToValue]);
fn set_value(&self, iter: &TreeIter, column: u32, value: &Value);
}