do-font

Used with append-font-items.

• (send a-wx:media-buffer do-font op recursive) -> void
      op : small integer
      recursive = #t : boolean

  The op argument must be the menu item id of an item installed by append-font-items.

  If recursive is not #f, then the command is passed on to any active snips of this buffer (i.e., snips which own the caret).