R1:1f8b237a0f4e

Stop Conpherence from reloading all messages on reply

Summary:
Currently, when you reply to a Conpherence thread, we load //all// the messages, not just the most recent ones. I don't //think// I broke this, it's just hard to tell that's what's happening unless the thread is very short or you scroll up.

The issue is that we're loading //threads// after some ID, but actually need to load //messages// (transactions) after that ID. Also, the way "before" and "after" work is sort of weird so this actually…