I would say that replacing overrides appending. In other words, if you
replace, you replace everything.
My rationale for that is that, in the absence of appending, each message
would be a different bubble. And a replace would completely replace that
bubble. Appending lets us keep older messages around while showing the
newer ones inside the same bubble. But a replace should reset the whole
lot, IMO.
And I think it would be easier to implement :-)
If you do get replace-just-the-one-message working nicely, though, I'd
be really interested to kick the tires on it and see how it feels.
I would say that replacing overrides appending. In other words, if you
replace, you replace everything.
My rationale for that is that, in the absence of appending, each message
would be a different bubble. And a replace would completely replace that
bubble. Appending lets us keep older messages around while showing the
newer ones inside the same bubble. But a replace should reset the whole
lot, IMO.
And I think it would be easier to implement :-)
If you do get replace- just-the- one-message working nicely, though, I'd
be really interested to kick the tires on it and see how it feels.
Mark