todo-done-separator

todo-done-separator is a variable defined in `todo-mode.el'.
Its value is

#("==========" 0 10 (face todo-done-sep))

Documentation:
String used to visually separate done from not done items.
Displayed as an overlay instead of `todo-category-done' when
done items are shown. Its value is determined by user option
`todo-done-separator-string'.