App.screen.check(y, 'jkl m', 'F - test_pagedown_can_start_from_middle_of_long_wrapping_line/screen:2')

  App.screen.check(y, 'jkl ', 'F - test_pagedown_can_start_from_middle_of_long_wrapping_line/screen:2')

  App.screen.check(y, 'no ', 'F - test_pagedown_can_start_from_middle_of_long_wrapping_line/screen:3')

  App.screen.check(y, 'mno ', 'F - test_pagedown_can_start_from_middle_of_long_wrapping_line/screen:3')

        assert(bpos > 0)  -- avoid infinite loop when window is too narrow

        if bpos == 0 then break end  -- avoid infinite loop when window is too narrow

  if x == 0 then
    return 1
  end

  local left, right = 1, len+1

  local left, right = 0, len+1