code: def _highlight_line_udiff(self, line, next):
          
          start = 0
          limit = min(len(line['line']), len(next['line']))
          while start < limit and line['line'][start] == next['line'][start]:
              start += 1
          end = -1
          limit -= start
          while -end <= limit and line['line'][end] == next['line'][end]:
              end -= 1
          end += 1
          if start or end:
              def do(l):
                  last = end + len(l['line'])
                  if l['action'] == 'add':
                      tag = 'ins'
                  else:
                      tag = 'del'
                  l['line'] = '%s<%s>%s</%s>%s' % (
                      l['line'][:start],
                      tag,
                      l['line'][start:last],
                      tag,
                      l['line'][last:]
                  )
              do(line)
              do(next)
docs: Highlight inline changes in both lines.