[oneeyedpigeon]

I also sent a LOT of Slack messages prematurely for the same reason. Used to it now, though. The more an interface emphasises the single-line nature of a text input, the better. Multi-line should never submit on enter, single-line always should.

[thinkharderdev]

Same, but it's configurable in slack so now I have it configured the Enter inserts a line break and Cmd+Enter submits the message