[clang] [clang][Diagnostics] Highlight code snippets (PR #66514)

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eaeltsin wrote:

> If you have a solid piece of internal testing blocked by this, can you provide us with more data? Ideally a working reproducer. This would be more productive than just reverting.

Sure, we are working on this and will share if we are successful. But please take into account it is often very non-trivial and time consuming to reduce a huge piece of internal code to a shareable state (might literally take days of work). Thus, having a way to proceed with further testing (== command-line flag to disable) in parallel with investigation is IMHO a must.




https://github.com/llvm/llvm-project/pull/66514