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

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================
@@ -887,6 +906,9 @@ void Preprocessor::Lex(Token &Result) {
     switch (CurLexerKind) {
     case CLK_Lexer:
       ReturnedToken = CurLexer->Lex(Result);
+      if (ReturnedToken && CurLexer &&
+          CurLexer->getFileID() == SourceMgr.getMainFileID())
+        saveCheckPoint(CurLexer->BufferPtr);
----------------
cor3ntin wrote:

Should we test for `IsAtStartOfLine` here?


```suggestion
      if (ReturnedToken &&
          CurLexer->getFileID() == SourceMgr.getMainFileID())
        saveCheckPoint(CurLexer->BufferPtr);
```

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