Notices from user to which the user sent a message should be forwarded with their own from="user!…" value
At the moment, every notice is sent from the irc server JID, because it’s annoying, when we get connected to a server, to have a lot of private discussion being opened (one from Global, one from hitchcock.freenode.org, one from ChanServ etc).
But we sometimes need these notices to be sent in their own private discussion (i.e. from foo!irc.example.com instead of irc.example.com). For example when we send a private message to NickServ, it responds with a notice, and we want that message to appear in the private discussion.
We need to remember the list of nicks we sent a message to.
(from redmine: created on 2015-01-12, closed on 2015-01-12)