Pressing "Enter" on the "Reply to SMS" field of the SMS notification will clear the notification and erase the typed text, but the reply is not sent.

[Stunts]

When recieving an SMS in ubuntu touch, you can reply to this text message in the notification area directly.
However, if you press "enter" to add a newline, the text you have just typed gets deleted, the reply closed, just like as if you had pressed "send", but no message gets sent.
This happens on my BQ Aqauris E4.5 with all the latest updates.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Tim (timerrington)]

Also happening in MX4 release R4

[Stunts (f-pinamartins)]

As of OTA13 (at least) this is no longer an issue.
Pressing "Enter" in the SMS reply box from the notification area will add a newline, as expected.
The SMS will not get sent until "Send" is pressed, also as expected.
I suppose this has been fixed somewhere during the last year. I think it can be closed now.