bug#58974: 28.2; saving a message in multiple groups

[Robert Pluim]

>>>>> On Thu, 03 Nov 2022 10:07:45 -0700, Waleed Yousef <wyousef@fcih.net> said:

    Waleed> From the group buffer, and without entering any group, the variable
    Waleed> value of gnus-newsgroup-name is nil, which I already check in the 
if condition. However, if I create a
    Waleed> message the header is: Gcc: nnfolder+archive:

Youʼre right, itʼs nil in the *Group* buffer, but then itʼs bound to
"" by `gnus-msg-mail', which has been there for ages, so itʼs not
something Iʼd change lightly. How about this:

(setq gnus-message-archive-group
  '((if (not (string-empty-p gnus-newsgroup-name))
        gnus-newsgroup-name
       "nnml:ADS")))

Robert
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