MUC Dup spam
When reconnecting (due to suspend/resume or connection drop etc), you get some duplicated lines (topic, last line someone sent).
I find this somewhat annoying :(
- Only print "User has set topic to ..." once, when creating the muc window, then only when it changes.
- Only print lines from backlog when first creating the window, then only if you get log from when the connection was down.