`GtkTreeListRow` is used by `GtkTreeListModel` to represent items.
It allows navigating the model as a tree and modify the state of rows.
`GtkTreeListRow` instances are created by a `GtkTreeListModel` only when the [property@Gtk.TreeListModel:passthrough] property is not set.
There are various support objects that can make use of `GtkTreeListRow` objects, such as the [class@Gtk.TreeExpander] widget that allows
displaying an icon to expand or collapse a row or [class@Gtk.TreeListRowSorter] that makes it possible to sort trees properly.