make_data_column (ia, tree_view, input, i));
g_object_set (G_OBJECT (tree_view), "has-tooltip", TRUE, (void *) NULL);
g_signal_connect (tree_view, "query-tooltip",
G_CALLBACK (input ? on_query_input_tooltip
: on_query_output_tooltip), ia);
make_data_column (ia, tree_view, input, i));
g_object_set (G_OBJECT (tree_view), "has-tooltip", TRUE, (void *) NULL);
g_signal_connect (tree_view, "query-tooltip",
G_CALLBACK (input ? on_query_input_tooltip
: on_query_output_tooltip), ia);