Comment by vbezhenar

This is a lot of pain.

It is very easy to fix. Add button somewhere around text box. Which turns it into multiline text edit control, increases its height. Now <Enter> works as line feed and to submit the text user have to click "send" button. Most of chat messages are not multi-line, but few are and for them, proper edit UI is essential.

I, personally, just use separate text editor like Gnome Text Edit to compose my message and then Ctrl+C/Ctrl+V to send it.