bug#68510: Bug in gnus' C-u S v

[Michael Albinus via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Tomas Volf <~@wolfsden.cz> writes:

> Hello,

Hi Tomas,

> I think I found a bug in debbugs, however I am not sure if the bug is in
> documentation or in the code.  Steps to reproduce (in emacs -Q):
>
> In *scratch* buffer:
>    (require 'debbugs-gnu)
>    (debbugs-gnu-bugs 66531)
>
> In the new buffer open the message and navigate cursor to last message from Mike
> Gran (47: ).  Now, when I want to reply, I press S v and it opens a buffer with
> (addresses are censored):
>
>     To: Mike Gran <xxx>
>     Cc: Tomas Volf <xxx>,  "xxx@debbugs-gnu-org" <xxx>
>     Subject: Re: bug#66531: [PATCH] ftw: Fix getuid-or-false, getgid-or-false macros.
>     From: me@hostname.mail-host-address-is-not-set
>     --text follows this line--
>
> So far that is expected.  However when I want to quote the original message, I can, based on the reading of the manual, use C-u S v:
>
>> If prefix argument YANK is non-nil, the original article(s) will be yanked
>> automatically.
>
> However while that does work, additional undocumented (and unwanted) changes are
> done as well,producing a following message:
>
>     To: Mike Gran <xxx>
>     Cc: Tomas Volf <xxx>,  Tomas Volf <xxx>,  control@debbugs-gnu-org,  xxx@debbugs-gnu-org
>     Subject: Re: bug#66531: [PATCH] ftw: Fix getuid-or-false,
> getgid-or-false macros., bug#66531: [PATCH] ftw: Fix getuid-or-false,
> getgid-or-false macros., bug#66531: [PATCH] ftw: Fix getuid-or-false,
> getgid-or-false macros., bug#66531: [PATCH] ftw: Fix getuid-or-false,
> getgid-or-false macros., control message for bug #66531, control
> message for bug #66531
>     From: me@hostname.mail-host-address-is-not-set
>     --text follows this line--
>     Mike Gran <xxx> writes:
>
>     [..]
>
> Notice that the subject is pretty weird, and for some reason there is a control
> server in the CC list.  I do not know if this is expected (well, at least I did
> not expect it), but it at the very least does not seem to be documented.  Based
> on my reading of the C-h k S v I would have expected just the "Mike Gran
> <xxx> writes:" change.

Zhanks for the report, I could reproduce it. However, it doesn't seem to
be a Debbugs bug, but rather a Gnus bug. I've reproduced it by using
Gnus w/o Debbugs.

For this, I've started a new Emacs instance w/o debbugs. I've opened
Gnus, and browsed the gmane server {nntp:news.gmane.io} for the group
gmane.lisp.guile.bugs. Message 10682 is the one you've mentioned above.

Typing in the Summary buffer 'C-u S v' shows the error.

I'm therefore changing the subject, adding Eric Abrahamsen into Cc.

> Thank you and have a nice day,
> Tomas Volf

Best regards, Michael.