Nickname in join presence ignored
Description of the issue
When joining a IRC Channel it seems biboumi stores the nickname somewhere. When i leave the IRC Channel, then want to join with a different nickname, biboumi seems to ignore this and joins with the old nickname.
This leads to issues as i send a join presence with a nickname, and get a self presence back with a different nickname.
This would be allowed by the MUC XEP if the self presence contained a 210 Status Code so the client knows that the service has rewritten the nickname.
Is it necessary that biboumi ignores the nickname in the join presence?
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