Telepathy should support edited messages (i.e. messages that have been sent, and then are resent after e.g. fixing a typo).
The 'supersedes' Messages header supports this, see Bug #25636. Please reassign this to whatever CM has a protocol supporting this usage, or clone it or something if there's more than one; XEP-0058 seems to be the relevant thing for XMPP.
XEP-0058 (Multi-User Text Editing) [1] was deferred. XEP-0308 (Last Message Correction) [2] is a new, more focused approach to this. [1]: http://xmpp.org/extensions/xep-0058.html [2]: http://xmpp.org/extensions/xep-0308.html
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