Is the code/text in the code block plain text? Or do you still do formatting in there.
Regularly i have commands or code with the apostrophe replaced by a "smart quote", or with a new line after the command (which is not great when you want to paste it directly into a terminal. I hope the new code block will resolve this problem.
Also, it would be great it you make selecting the code in a code block easier. Now i still have to select the entire content, but it would be great if the first click in the code block would do this for you.