Re: ToContainsFilter removed?

I had used the filter to get only chats for a specific user. Cf.

https://github.com/jenkinsci/jabber-plugin/blob/8e42c15b9ab22bf205c5f3a0ec57d937 f4ee537d/src/main/java/hudson/plugins/jabber/im/transport/JabberIMConnection.ja v a#L477

I've made some comments on your commit. Hope you don't mind. Note that another new feature of the Smack 4 API is MultiUserChat.createOrJoin(), you may want to use this method.