Gtk.TreeViewColumn.prototype.cell_set_cell_data

function cell_set_cell_data(tree_model:Gtk.TreeModel, iter:Gtk.TreeIter, is_expander:Boolean, is_expanded:Boolean):void {
    // Gjs wrapper for gtk_tree_view_column_cell_set_cell_data()
}

Sets the cell renderer based on the tree_model and iter. That is, for every attribute mapping in tree_column, it will get a value from the set column on the iter, and use that value to set the attribute on the cell renderer. This is used primarily by the Gtk.TreeView.