Relevant quote from docs.

"Observers must not carry out actions that exactly one process must take responsibility for (e.g. acknowledging text messages, or carrying out the actual file transfer), since arbitrarily many observers can be activated for each channel. The handler is responsible for such tasks."

Though personally, having thought about it this seems like a sensible thing for the plasmoid to do so I'm not sure. Will talk to tp people.

Well, the reason it acknowledges is because it was designed to be a handler. And I think we should make sure it is before we release, rather than stopping it from acking.

Now that it is a handler, can this bug be closed?

We still become an observer after we delegate and according to the spec we shouldn't ack then.

But now that Guillaume Desmottes said "gnome shell acks message" even when it's an observer, we can close it. It's still against the spec, but doing the same as telepathy people so it's fine.

(http://www.mail-archive.com/telepathy@lists.freedesktop.org/msg05553.html)