bug#25658: 26.0.50; ELisp part in a mail isn't encoded properly

[Eli Zaretskii]

> Date: Fri, 10 Feb 2017 09:56:47 +0900
> From: Katsumi Yamaoka <yamaoka@jpl.org>
> 
> On Thu, 09 Feb 2017 11:35:50 +0900, Katsumi Yamaoka wrote:
> > In a message draft, an ELisp part containing non-ASCII letters,
> > like the following, is not encoded properly.
> 
> > <#part type="application/emacs-lisp" disposition=inline>
> > (defun mm-shr (handle)
> >   ...
> >      ;; Remove "soft hyphens".
> >      (goto-char (point-min))
> >      (while (search-forward "­" nil t)
> >        (replace-match "" t t))
> > <#/part>
> 
> ;; Note that "­" is a soft hyphen.
> 
> What Gnus wants to do is:
> 
> (quoted-printable-encode-string
>  (encode-coding-string "­" 'iso-8859-1))
>  => "=AD"

Then why doesn't Gnus do exactly that?