I need it to fix https://bugzilla.gnome.org/show_bug.cgi?id=654015
Created attachment 48814 [details] [review]
We use to say that this wasn't needed because TpTextChannel is already doing
the ID -> TpMessage lookup but at least the logger and Empathy need it so it's
probably worth it.
Review of attachment 48814 [details] [review]:
Merged to master; will be in 0.15.3