bug#26298: 26.0.50; Gnus fails to sign mail with PGP

[Toon Claes <toon@iotcl.com>]

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I have found what is happening.

If I add the following line to `mml-secure-epg-sign', I can successfully
sign my email:

#+begin_src emacs-lisp :tangle yes
    (setf (epg-context-pinentry-mode context) 'loopback)
#+end_src

Now I also understand why `epa-sign-file' works, I have set
`(setq epa-pinentry-mode 'loopback)' in my init.el.

But, I could use some advice on building a proper fix that would work
for everyone. We could do something similar like as epa.el does, and add
yet another defcustom, but doesn't feel very DRY.
So I hope someone can chime in to give some advice.


-- Toon

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