TextChannel's API needs filling in. I've done a sketch of the API in the linked branch. oggis points out that QSharedDataPointer does implicit sharing (copy on write), which might be more appropriate if we ever want Message to be mutable. This would be useful if we want to have an API like QString send(Message message, guint flags) where you construct a blank Message, stuff things into it and send it. (See telepathy-glib's TpMessageMixin, which does the same thing on the service side.)
Fixed in 0.1.0
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