save-excursionThe save-excursion function is the final special form that we
will discuss in this chapter.
In Emacs Lisp programs used for editing, the save-excursion
function is very common. It saves the location of point,
executes the body of the function, and then restores point to
its previous position if its location was changed. Its primary
purpose is to keep the user from being surprised and disturbed by
unexpected movement of point.