class Test::Unit::Diff::SequenceMatcher

def longest_match(from_start, from_end, to_start, to_end)
  best_info = find_best_match_position(from_start, from_end,
                                       to_start, to_end)
  unless @junks.empty?
    args = [from_start, from_end, to_start, to_end]
    best_info = adjust_best_info_with_junk_predicate(false, best_info,
                                                     *args)
    best_info = adjust_best_info_with_junk_predicate(true, best_info,
                                                     *args)
  end
  best_info
end