let text = skipped_txt ^ nonskipped_txt in
let prefix_len = MatitaGtkMisc.utf8_string_length skipped_txt in
let enriched_history_fragment =
let text = skipped_txt ^ nonskipped_txt in
let prefix_len = MatitaGtkMisc.utf8_string_length skipped_txt in
let enriched_history_fragment =