Any way to compose (add) a delta from external source without triggering onChange

[NicolasDionB]

I'm trying to figure out how to do this: a user is editing text and another one is editing the same text, thus sending delta to the other. The problem I have is how can I inject the received delta without triggering an event on the changes stream or at least, be able to ignore the changes made from the external user so I know I don't have to send an update to the other user with the same modifications over again.

Obviously I could skip the next change event but the local user can do modifications as well so it might be a mix of the two. Am I mistaking? Has anyone tried to do such a thing and if so, how?