Some protocols as MSN or Jabber (Pidgin implements it using XEP-0231: Bits of Binary) support custom smileys. The telepathy spec should describe how to implement those.
This blocks https://bugzilla.gnome.org/show_bug.cgi?id=604178
Do we still need a custom API for that? It seems that http://telepathy.freedesktop.org/spec/Channel_Interface_Messages.html and http://telepathy.freedesktop.org/spec/Channel_Interface_HTML.html is the way to go.
Is there a way to know what image format is supported by the CM. This was pretty much the issue that I was aware around supporting text style.
Yes, as with HTML (Bug #15449), the main thing missing is capability discovery. It's not a very good user experience if the UI will offer to send custom smilies to, say, an IRC user, and then the message gets rejected when you try to send it because IRC can't actually do that. I don't know whether there'll need to be "levels of compliance" or flags here, or whether it'll just be "supported? y/n".
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