Develop interface for storing message drafts

[gkiagia]

In modern protocols, a message draft may be stored and synchronized across devices. There should be a channel interface for this.

[boiko]

One idea related to that: the glib and Qt implementations could have a default implementation to save drafts even when the protocol itself doesn't have those capabilities (storing them locally). This way the clients can have a unified way to retrieve drafts both local and server side.

[Kaffeine]

Yes, this is a very good idea!

We discussed that interface on FOSDEM (I hoped to see you there).

We agreed that this feature can be implemented as a property and now I got an idea that the property should be not just a string, but an "aa{sv}", like Message, because it should be possible to also save attached media.