org-contacts bug when completing tags in gnus

[Alan Schmitt <alan.schmitt@polytechnique.org>]

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Hello,

I'm giving org-contacts a try, and I'm having an error when I'm trying
to complete a tag (something should be a sequence but it's a number).
Digging a little into it, it seems that the problem is during
hilighting, where a fontified string is returned by all-completions
instead of a list (in `completion-pcm--all-completions' in minibuffer.el),
which then make `completion-hilit-commonality' fail because it expects a
list. I'm only seeing this problem with org-contacts, so I'm wondering
if it might be the reason for this problem in emacs code.

My contacts file looks like this:

* Test                                                              :test:
:PROPERTIES:
:EMAIL: alan.schmitt@polytechnique.org
:END:

To reproduce, save this in some path/contacts.org file, do the following

  (require 'org-contacts)
  (org-contacts-gnus-insinuate)
  (setq org-contacts-files (list "path/contacts.org"))
  
then start an email in gnus, in the To field write +, then hit TAB.

I'm using org-mode 9 and emacs 25.1.1. Is this a known problem with
them?

Thanks,

Alan

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