print('pageup')

--?   print('pageup')

--?     print(y, top2.line)

--?     print(y, top2.line, top2.screen_line, top2.screen_pos)

  print('pageup end')

--?   print('pageup end')

  print('pagedown')

--?   print('pagedown')

  print('pagedown end')

--?   print('pagedown end')

    result.screen_pos = pos1.pos
  else
    for i=#Lines[pos1.line].screen_line_starting_pos,1,-1 do
      local spos = Lines[pos1.line].screen_line_starting_pos[i]
      if spos <= pos1.pos then
        result.screen_line = i
        result.screen_pos = pos1.pos - spos + 1
        break
      end

    Text.populate_screen_line_starting_pos(pos1.line)
  end
  for i=#Lines[pos1.line].screen_line_starting_pos,1,-1 do
    local spos = Lines[pos1.line].screen_line_starting_pos[i]
    if spos <= pos1.pos then
      result.screen_line = i
      result.screen_pos = pos1.pos - spos + 1
      break

      return {line=pos2.line-1, screen_line=1, screen_pos=1}
    else
      return {line=pos2.line-1, screen_line=#Lines[pos2.line-1].screen_line_starting_pos, screen_pos=1}

      Text.populate_screen_line_starting_pos(pos2.line-1)

    return {line=pos2.line-1, screen_line=#Lines[pos2.line-1].screen_line_starting_pos, screen_pos=1}

--?   print('Text.populate_screen_line_starting_pos')

--?   print('Text.populate_screen_line_starting_pos', line_index)

  print('clearing fragments')

--?   print('clearing fragments')