class Diff::LCS::Hunk

def flag_context=(context) #:nodoc:
  return if context.nil? or context.zero?
  add_start = (context > @start_old) ? @start_old : context
  @start_old -= add_start
  @start_new -= add_start
  if (@end_old + context) > @data_old.size
    add_end = @data_old.size - @end_old
  else
    add_end = context
  end
  @end_old += add_end
  @end_new += add_end
end