Why don't tabbed code blocks render in Reading mode?

@Jopp @CawlinTeffid @dawni @ariehen

I started a poetry-specific topic here to discuss advanced formatting techniques in general and poetry in particular. I put it in Meta to make it as open as possible—from what I’ve seen here and in other forums, poetry formatting is a common issue. I’m guessing it’s a small percentage of users, but they are passionate. :wink:

Please feel free to contribute!