bug#21072: 24.5; inconsistent behaviour of `C-M-h (mark-defun)' in Emacs Lisp

[Drew Adams]

Again, thanks for working on this.

> (defun in-comment-line-p ()
>   "Return non-nil if the point is in a comment line.
> See http://lists.gnu.org/archive/html/help-gnu-emacs/2016-
> 08/msg00141.html"

The second doc-string sentence should just be a comment in the
code, if it is needed at all.

> If the mark is active, it marks the next defun after the one(s)
> already marked.  With positive ARG, mark that many more defuns.

more -> next

>   ;; Trick with 'mark-defun-back due to Drew Adams

No need for the attribution. ;-)

I didn't really test, but for this:

(defun a ()
  nil)
(defun b ()
  nil)
;;;;
(defun c ()
  nil)

With point anywhere in either of the last two defuns or
on the comment line between them, `M-- C-M-h' selects not
only the expected defun but also the last line of the
defun before it.

E.g., with point at the beginning of the comment line,
this is selected:

  nil)
(defun a ()
  nil)