if State.cursor_y > App.screen.height - State.line_height then

    if State.cursor_y > App.screen.height - State.line_height then

    if State.cursor_y > App.screen.height - State.line_height then

    print('cursor is NOT at final screen line of its line')
    print('switching pos of screen line at cursor from '..tostring(screen_line_starting_pos)..' to '..tostring(new_screen_line_starting_pos))

    local scroll_down = Text.le1(State.screen_bottom1, State.cursor1)

    local screen_line_index, screen_line_starting_pos = Text.pos_at_start_of_screen_line(State, State.cursor1)
    local new_screen_line_starting_pos = State.line_cache[State.cursor1.line].screen_line_starting_pos[screen_line_index+1]

    local scroll_down = Text.le1(State.screen_bottom1, State.cursor1)
    local screen_line_starting_pos, screen_line_index = Text.pos_at_start_of_screen_line(State, State.cursor1)
    local new_screen_line_starting_pos = State.line_cache[State.cursor1.line].screen_line_starting_pos[screen_line_index+1]

  if Text.cursor_out_of_screen(State) then

  if Text.cursor_out_of_screen(State) then

  if Text.cursor_out_of_screen(State) then

    if Text.cursor_out_of_screen(State) then

function Text.cursor_out_of_screen(State)

  return State.cursor_y == nil

  State.cursor_x = nil
  State.cursor_y = nil

  end
  if State.foo then
    print('draw: screen top', State.screen_top1.line, State.screen_top1.pos, 'cursor', State.cursor1.line, State.cursor1.pos, 'screen bottom', State.screen_bottom1.line, State.screen_bottom1.pos)
  State.bottom = y

  end

    if Text.cursor_out_of_screen(State) then