bug#52871: 29.0.50; weird bug with Gnus, can't have "^From" in `message-hidden-header's

[Robert Pluim]

>>>>> On Fri, 21 Jan 2022 10:15:30 +0100, Lars Ingebrigtsen <larsi@gnus.org> 
>>>>> said:

    Lars> Michael Heerdegen <michael_heerdegen@web.de> writes:
    >> Did you actually try to send a message?  With Gnus Mock it's impossible
    >> here to reply to any of the INBOX messages using that value of
    >> `message-hidden-headers' and send successfully.

    Lars> I don't use Gnus-mock or anything.  Here's my recipe:

    Lars> emacs -Q
    Lars> M-: (setq message-hidden-headers '("^Face"
    Lars>                                "^From"
    Lars>                                "^Mail-Copies-To"
    Lars>                                "^References"
    Lars>                                "^X-Draft-From"
    Lars>                                "^X-Face") ) RET
    Lars> C-x m
    Lars> <edit the headers so they're valid>
    Lars> C-c C-c
    Lars> smtp RET
    Lars> quimby.gnus.org RET
    Lars> n

As Michael points out: I think this only happens when youʼre replying
to an existing message, not composing a new one.

Robert
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