Oops, my code was not correct, the list was not freed :-(
Here is a new (and hopefully better) version:
GtkTreeModel *model2 = GTK_TREE_MODEL (model);
CList *l = gtk_tree_selection_get_selected_rows (tree_view);
GtkTreePath *path;
GtkTreeIter iter;
char *str;
GList *list = l;
while (l) {
path = GTK_TREE_PATH (l->data);
gtk_tree_model_get_iter (model2, &iter, path);
gtk_model_get (model, &iter, 0, &str, -1);
g_print (str);
g_free (str);
l = l->next;
}
g_list_foreach (list, gtk_tree_path_free, NULL);
g_list_free (list);
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