Ref T12562. I think the pre-send-on-enter behavior was: disable textarea, send message, clear area on response?
That got changed but not completely, maybe. There's currently an issue here:
- Add a sleep(3) to UpdateController.
- Type "AAA".
- Press enter.
- Real fast, type "BBB".
- When the "AAA" arrives, your "BBB" is lost. Sad!