Posting failed: 441 Duplicate Content-Type: header / GMime 3 API

Hi,

when the current gitlab version of Pan-0.147 (00493444) is build with
GMime3 lib I get the following error (Posting failed: 441 Duplicate
Content-Type: header) as described here:

https://gitlab.gnome.org/GNOME/pan/-/issues/114

The debug output shows two duplicate header fields:

>---------------------------------
(socket-impl-openssl.cc:673:do_write) socket 0x7f314c001380 channel
0x7f314c0032a0 maybe wrote [From: D. Graef  <[email protected]>
Subject: Test
Newsgroups: de.test
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset=UTF-8
MIME-Version: 1.0
X-no-archive: yes
User-Agent: Pan/0.147 (Sweet Solitude; 00493444
gitlab.gnome.org/GNOME/pan.git)
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Test Pan

.
]; status was 1

>---------------------------------

Duplicate header fields:

Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset=UTF-8


The related code (function: new_message_from_ui) begins here:

https://gitlab.gnome.org/GNOME/pan/-/blob/master/pan/gui/post-ui.cc#L1599

After a first look I don't know what's wrong, GMime 3 seems to be
different here than GMime 2. Is someone familiar with the GMime 3 API?


Best regards,

Detlef

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