how to accept an invitation in a rfc822 attachment? (mu4e or gnus-icalendar)

[Edgar Lux]

Hello, I would very much appreciate if someone could help me to accept an event 
invitation that I got (will likely happen again). The invitation is wrapped up 
in a rfc822 attachment. Thank you in advance.

The header of the (mu4e-article) message shows:

#+begin_example
  Attachments: [2. message/rfc822]... [3. message/rfc822]... [4. 
message/rfc822]...
#+end_example

(each of these is an invitation). If I do RET on one of them, I get

#+begin_example
  Attachments: [2. message/rfc822]... [3. message/rfc822]... [4. 
message/rfc822]...
   [6. text/html]... [7. text/calendar]...

  [ Uninvited Accept ]    [ Uninvited Tentative ]    [ Uninvited Decline ]

  [ Show Agenda ]
#+end_example

When I choose Uninvited Accept, I get this in the minibuffer

#+begin_example
  Really reply by mail to article author (y or n)
#+end_example

and this in the warnings:

#+begin_example
  ■  Warning (gnus-icalendar): Could not find an event attendee matching given 
identity
#+end_example

Then, I get this error (I have debug-on-error active)

#+begin_example
  Debugger entered--Lisp error: (error "This is a pseudo-article")
    signal(error ("This is a pseudo-article"))
    error("This is a pseudo-article")
    gnus-summary-select-article()
    gnus-summary-reply()
    gnus-icalendar-send-buffer-by-mail("*CAL*" "Accepted: Event name..." 
"someone@server.com")
    gnus-icalendar-reply(((#<buffer  *mm*-601036> ("text/calendar" (method . 
"PUBLISH") (charset . "utf-8")) base64 nil nil nil nil nil) accepted 
#<gnus-icalendar-event gnus-icalendar-event-156597d6cd34>))
    gnus-article-press-button(13)
    funcall-interactively(gnus-article-press-button 13)
    call-interactively(gnus-article-press-button nil nil)
    command-execute(gnus-article-press-button)
#+end_example

I am using mu4e, with this:

#+begin_src emacs-lisp
  (require 'mu4e-icalendar)
    (mu4e-icalendar-setup)
    ;; To enable optional iCalendar→Org sync functionality
    (setq
     gnus-icalendar-org-capture-file "files.org")
    (gnus-icalendar-org-setup)
#+end_src

GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.38, cairo 
version 1.17.8)
mu (mu4e) 1.10.7-1


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