gtk_widget_destroy (get_widget_assert (builder, "first-line"));
p->tree_view = create_lines_tree_view (
GTK_CONTAINER (get_widget_assert (builder, "first-line-scroller")), ia);
gtk_widget_destroy (get_widget_assert (builder, "first-line"));
p->tree_view = create_lines_tree_view (
GTK_CONTAINER (get_widget_assert (builder, "first-line-scroller")), ia);