Online users appear offline shortly after logging in
Running gajim and python-nbxmpp HEAD on Debian unstable (GTK 3.24.12-1).
Steps to reproduce the problem
A few minutes/seconds after logging in, some (not all) users are listed as offline in the roster (and also in their contact information window) even if they are actually online, can receive my messages and see me online all the time.
This is logged on the console:
/USR3/src/gajim/gajim/gajim/roster_window.py:172: Warning: g_sequence_iter_get_position: assertion 'iter != NULL' failed (ok, it) = self.modelfilter.convert_child_iter_to_iter(it)
I have to logout and login again to see the real status again for a short while.