commentblock in emacs-lisp mode is strange

[quazgar]

Observed behaviour

For me, using the cob (commentblock, from the prog-mode section) snippet in elisp mode produces this result:

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
                                        ;             Some comment            ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

What seems wrong to me

There are lots of whitespaces before the first ; and it's only a single ;, not as I expected ;;. Opposed to this behaviour, comment-region prepends double semicolons.

What the snippet should do

• All three lines should start with ;; at the beginning of the line.

Discussion

If the current behaviour is as intended, that's fine for me and the issue could be closed.

[quazgar]

On further investigation, this seems to be a general problem with yasnippet in lisp-mode: If the return value of a ${1:$( ... )} expression starts with a single semicolon, that line will be indented to column 40, which makes no sense for comment blocks.

So as a workaround I propose to put a double semicolon in front. I will post a pull request soon.

[quazgar]

See PR #454