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Fix #3431

This reverts commit 1492eed3.

Fix #3429

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

Because we actually don’t change the nick, we ignore it, just like in the
case of a normal join (of an other resource, or an other channel on the same
server).

fix #3419

As required by XEP 0359

Should fix #3369

See https://xmpp.org/extensions/xep-0359.html

See https://xmpp.org/extensions/xep-0045.html#message

By an other resource, or anything

fix #3423