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

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


cor3ntin wrote:

@tbaederr I will need time to review/discuss this patch with other folks (@AaronBallman). 
I thought we had agreement on a direction before it got reverted completely and it is not clear to me that doing whole file lexing for each warning isn't going to negatively impact some folks.

But I haven't forgotten about it!

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