[no subject]

[MOON@MIT-AI]

EDIT-DEFINITION has to search through the whole buffer to see if the
line is still in that buffer.  It would seem to be more of a win
to (like Multics Emacs) have a way of marking a line as deleted,
and to say that a line can never be moved from one buffer to another.
Then it can be determined if the line is validly part of the interval
without searching, just by checking for deletion.  It should then still
check if that line starts that defun.

I wonder if it should try sectionizing the buffer again once if the line
has been deleted; the user might have killed the defun and yanked it back.