When editing a message, deleting all the text and pressing enter should Delete the message

[dkowis]

Is your suggestion related to a problem? Please describe.
I edited a message, selected all the text, deleted it, and pressed enter. I got a new line, instead of deleting the message. I had to leave the keyboard, and go click on the message to Delete it.

Describe the solution you'd like
If I'm editing a message, and I delete all the text and press enter, I'd expect to be prompted with "Delete this message?"

Describe alternatives you've considered
Well, you can click on it, of course, to perform these actions.

Additional context
The flow is nicer not to leave the keyboard.

[t3chguy]

Duplicate of #11024