[bug-mailutils] movemail --keep-messages --uidl download the same message

[gumen]

Hello,

I ran into a problem with "movemail" program.  Flag --keep-messages
works fine but --uidl does not.  I keep getting the same mail messages
over and over.

I found this conversation:
https://www.mail-archive.com/bug-mailutils@gnu.org/msg01916.html

So I compiled latest release of mailutils hoping for bug to be fixed.

$ movemail --version
movemail (GNU Mailutils) 3.10
Copyright (C) 2007-2019 Free Software Foundation, inc.
Licencja GPLv3+: GNU GPL wersji 3 lub nowszej
<http://gnu.org/licenses/gpl.html>
(...)

I can definitely see fixes in commits and source code but issue keeps
appearing.  I have single mail on my mail server.  And after using
movemail three times:

$ movemail --verbose --debug-level='mailbox.prot,!trace6' --keep-messages 
--uidl "imap://<username>@<domain>" ~/mails <password>
$ movemail --verbose --debug-level='mailbox.prot,!trace6' --keep-messages 
--uidl "imap://<username>@<domain>" ~/mails <password>
$ movemail --verbose --debug-level='mailbox.prot,!trace6' --keep-messages 
--uidl "imap://<username>@<domain>" ~/mails <password>

I have three the same messages in ~/mails file.  The second part of
X-UIDL value is different for each message.  Maybe that is the issue.

$ grep X-UIDL mails
X-UIDL: 26c7d37fdd37ac75a365a22131fe5a38.1605699623.0
X-UIDL: 26c7d37fdd37ac75a365a22131fe5a38.1605699628.0
X-UIDL: 26c7d37fdd37ac75a365a22131fe5a38.1605700794.0

Please let me know If I'm doing something wrong or maybe I could help
you somehow.  Unfortunately I barely know C so I'm not able to debug
program myself :(

Thank you

irek