function test_pagedown_skip_drawings()
  print('test_pagedown_skip_drawings')

function test_pagedown_skips_drawings()
  print('test_pagedown_skips_drawings')

  check_eq(Lines[2].mode, 'drawing', 'F - test_pagedown_skip_drawings/baseline/lines')

  check_eq(Lines[2].mode, 'drawing', 'F - test_pagedown_skips_drawings/baseline/lines')

  App.screen.check(y, 'abc', 'F - test_pagedown_skip_drawings/baseline/screen:1')

  App.screen.check(y, 'abc', 'F - test_pagedown_skips_drawings/baseline/screen:1')

  print('test: top:', Screen_top1.line)

--?   print('test: top:', Screen_top1.line)

  App.screen.check(y, 'def', 'F - test_pagedown_skip_drawings/screen:1')

  App.screen.check(y, 'def', 'F - test_pagedown_skips_drawings/screen:1')
end
function test_down_arrow_moves_cursor()
  print('test_down_arrow_moves_cursor')
  App.screen.init{width=120, height=60}
  Lines = load_array{'abc', 'def', 'ghi', 'jkl'}
  Line_width = 120
  Cursor1 = {line=1, pos=1}
  Screen_top1 = {line=1, pos=1}
  Screen_bottom1 = {}
  Zoom = 1
  local screen_top_margin = 15  -- pixels
  local line_height = math.floor(15*Zoom)  -- pixels
  -- initially the first three lines are displayed
  App.draw()
  local y = screen_top_margin
  App.screen.check(y, 'abc', 'F - test_down_arrow_moves_cursor/baseline/screen:1')
  y = y + line_height
  App.screen.check(y, 'def', 'F - test_down_arrow_moves_cursor/baseline/screen:2')
  y = y + line_height
  App.screen.check(y, 'ghi', 'F - test_down_arrow_moves_cursor/baseline/screen:3')
  -- after hitting the down arrow the screen is unchanged
  App.run_after_keychord('down')
  y = screen_top_margin
  App.screen.check(y, 'abc', 'F - test_down_arrow_moves_cursor/screen:1')
  y = y + line_height
  App.screen.check(y, 'def', 'F - test_down_arrow_moves_cursor/screen:2')
  y = y + line_height
  App.screen.check(y, 'ghi', 'F - test_down_arrow_moves_cursor/screen:3')
  -- but the cursor moves down by 1 line
  check_eq(Cursor1.line, 2, 'F - test_down_arrow_moves_cursor/cursor')
end
function test_down_arrow_scrolls_down_by_one_line()
  print('test_down_arrow_scrolls_down_by_one_line')
  -- display the first three lines with the cursor on the bottom line
  App.screen.init{width=120, height=60}
  Lines = load_array{'abc', 'def', 'ghi', 'jkl'}
  Line_width = 120
  Cursor1 = {line=3, pos=1}
  Screen_top1 = {line=1, pos=1}
  Screen_bottom1 = {}
  Zoom = 1
  local screen_top_margin = 15  -- pixels
  local line_height = math.floor(15*Zoom)  -- pixels
  App.draw()
  local y = screen_top_margin
  App.screen.check(y, 'abc', 'F - test_down_arrow_scrolls_down_by_one_line/baseline/screen:1')
  y = y + line_height
  App.screen.check(y, 'def', 'F - test_down_arrow_scrolls_down_by_one_line/baseline/screen:2')
  y = y + line_height
  App.screen.check(y, 'ghi', 'F - test_down_arrow_scrolls_down_by_one_line/baseline/screen:3')
  -- after hitting the down arrow the screen scrolls down by one line
  App.run_after_keychord('down')
  y = screen_top_margin
  App.screen.check(y, 'def', 'F - test_down_arrow_scrolls_down_by_one_line/screen:1')
  y = y + line_height
  App.screen.check(y, 'ghi', 'F - test_down_arrow_scrolls_down_by_one_line/screen:2')
  y = y + line_height
  App.screen.check(y, 'jkl', 'F - test_down_arrow_scrolls_down_by_one_line/screen:3')

    print(y, line_index, line)

--?     print(y, line_index, line)

    print('a')

--?     print('a')