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

[Timm Baeder via cfe-commits]

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In-Reply-To: <llvm.org/llvm/llvm-project/pull/66514 at github.com>


tbaederr wrote:

FYI  I think this is ready for proper review now. We could still add some tests of course. It's using a maximum file size now and highlights the entire requested line range in one go.

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