for _, f in ipairs(line_cache.fragments2) do

  for _, f in ipairs(line_cache.fragmentsB) do

  if line_cache.fragments2 == nil then
    line_cache.fragments2 = Text.compute_fragmentsB(State, line, x)

  if line_cache.fragmentsB == nil then
    line_cache.fragmentsB = Text.compute_fragmentsB(State, line, x)

  for _, f in ipairs(line_cache.fragments2) do

  for _, f in ipairs(line_cache.fragmentsB) do

--?   print('compute_fragments2', line_index, 'between', x, State.right)

--?   print('compute_fragmentsB', line_index, 'between', x, State.right)