Control + enter should enter ASCII newline

[srazzell]

If you press control + enter, you get a new line, but the line numbers stack on top of each other.

Reproducibility: Always
MacOS: 14.2.1
Tested on commit: cd77c2d

Screenshots:

[mchakravarty]

Thanks! Unicode newline characters aren't handled properly.

I will fix this, but I assume that this is not an urgent issue. Let me know if it is for you.