The interface for sortable models used by GtkTreeView
39.1 Overview
<gtk-tree-sortable> is an interface to be implemented by tree models
which support sorting. The <gtk-tree-view> uses the methods provided by
this interface to sort the model.
39.2 Usage
— Class: <gtk-tree-sortable>
Derives from <ginterface>.
This class defines no direct slots.
— Signal on <gtk-tree-sortable>: sort-column-changed