todo-toggle-mark-item
todo-toggle-mark-item is an interactive compiled Lisp function in `todo-mode.el
'.
(todo-toggle-mark-item &optional N)
Mark item with `todo-item-mark' if unmarked, otherwise unmark it.
With positive numerical prefix argument N, change the marking of
the next N items in the current category. If both the todo and
done items sections are visible, the sequence of N items can
consist of the the last todo items and the first done items.