GtkTreeModelSort A wrapper which makes an underlying tree model sortable @child_model: @Returns: @func: @sort_col: @model: @tree_model: @Returns: @tree_model_sort: @child_path: @Returns: @tree_model_sort: @sort_iter: @child_iter: @tree_model_sort: @sorted_path: @Returns: @tree_model_sort: @child_iter: @sorted_iter: @tree_model_sort: @tree_model_sort: @tree_model_sort: @iter: @Returns: