I see that XEP-0085 ("Chat State Notifications") which can be thought
as being a "spiritual successor" to the deprecated XEP-0022 ("Message
Events") lacks support for the "message is stored in the server's
offline storage" notification.While this omission is understandable (XEP-0085 explicitly positions itself as a "client-to-client only" mechanism), being notified of successfull offline storage is very convenient, and in fact this is the major reason message events still not deprecated in Tkabber yet (also because they're still supported in ejabberd). So my question is: is there any "contemporary" (i.e. recommended) mechanism to get notifications for messages successfully stored by the peer's server to its offline storage? (Preferably without resorting to such monstrous protocols as AMP). Also may be the "client-only strictness" of XEP-0085 mentioned above is too tight a requirement and it's possible to augment XEP-0085 somehow so that the server could generate something analogous to the XEP-0022's <offline> notification in suitable cases?
