bug#25645: reproducer?

["Alex Bennée" <alex.bennee@linaro.org>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Alex Bennée <alex.bennee@linaro.org>
>> Cc: 25645@debbugs.gnu.org
>> Date: Wed, 04 Oct 2017 01:31:39 +0100
>>
>> copying: message-default-charset -> utf-8
>
> A stab in the dark: what if you filter out message-default-charset
> from the cloned locals?

Good guess:

(defun message-clone-locals (buffer &optional varstr)
  "Clone the local variables from BUFFER to the current buffer."
  (message "message-clone-locals: %s" buffer)
  (let ((locals (with-current-buffer buffer (buffer-local-variables)))
	(regexp "^gnus\\|^nn\\|^message\\|^sendmail\\|^smtp\\|^user-mail-address"))
    (mapcar
     (lambda (local)
       (when (and (consp local)
		  (car local)
		  (string-match regexp (symbol-name (car local)))
		  (or (null varstr)
		      (string-match varstr (symbol-name (car local)))))
	 (ignore-errors
           (unless (string-match "message-default-charset" (symbol-name (car local)))
             (message "copying: %s -> %s" (car local) (cdr local))
	     (set (make-local-variable (car local))
		  (cdr local))))))
     locals)))

Although I feel a slightly neater solution is needed.

So is the problem we are attempting to double encode an already encoded
buffer or something else?

--
Alex Bennée