>>>It also affects a *lot* of existing messages, such as Thread #365455 Message #365737. I doubt you could ever fix them all manually...
>>
>>Yes, of course, as I said, it's already in my list of things to do to standardize all this. I'm working on it since two hours now.
>
>Suggestion: You could add a link at the bottom of each message, comparable to the current "Show/Hide acronyms", "Show/Hide autolinks", to use/not use syntax coloring. This would ensure compatibility with old messages.

There's no need to. I haven't done this to offer two ways of viewing content. All that is mostly fixed now. All for exceptions, I'll take care of them later on.