file-menu:between-print-and-close

• (send a-mred:simple-menu-frame file-menu:between-print-and-close file-menu) -> void
      file-menu : a mred:menu% object

  This add the ``Split Horizontally'', ``Split Vertically'' and collapse menu items to the file menu. They split the wx:media-edit% for the return values of get-edit in this frame.