Release Notes: - Show invisibles in the editor Relands #19298 Trying to quantify a performance impact, it doesn't seem to impact much visible in Instruments or in a micro-benchmark of Editor#layout_lines. We're still taking a few hundred micro-seconds (+/- a lot) every time. The ascii file has just ascii, where as the cc file has one control character per line. <img width="1055" alt="Screenshot 2024-10-28 at 12 14 53" src="https://github.com/user-attachments/assets/1c382063-bb19-4e92-bbba-ed5e7c02309f"> <img width="1020" alt="Screenshot 2024-10-28 at 12 15 07" src="https://github.com/user-attachments/assets/1789f65e-5f83-4c32-be47-7748c62c3703">