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"Observers MUST NOT carry out actions that exactly one process must
take responsibility for (e.g. acknowledging Text messages...)."

Given this is a user facing observer, we can tell when the user has
seen this message, so I don't see why there's any reason we should not
be acknowledging the messages.
We were using this acknowledged message system as a way to keep track
of the "unread messages" in both the main chat handler and the
plasmoid and show/remove the correct notifications in the two places.

So in short; in this particular case is it ok for an observer to ack
messages? I think it is, but I don't want to go against the spec,
particularly something in capital letters.
If not how does Gnome-Shell handle this?

David