> If a client claims to have sent a message at an unusual time (say, > 10 seconds in the past, or after the app was already quit, or whatever criteria you want to set), then just insert it at that point in the conversation, and visually indicate to the user the discrepancy.
I don't know that OP would be happy with that, and certainly someone would need to a) actually design the UI for it b) figure out what information the client needs from the server to implement that, and whether it's possible for the server to provide that information.
I think you're probably right, FWIW, but someone needs to actually do the legwork of designing and implementing what you're suggesting rather than just handwaving it.
I don't know that OP would be happy with that, and certainly someone would need to a) actually design the UI for it b) figure out what information the client needs from the server to implement that, and whether it's possible for the server to provide that information.
I think you're probably right, FWIW, but someone needs to actually do the legwork of designing and implementing what you're suggesting rather than just handwaving it.