[clang-tools-extra] [clang] [clang][tidy] Ensure rewriter has the correct CWD (PR #67839)

[Piotr Zegar via cfe-commits]

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@@ -189,9 +191,12 @@ class ErrorReporter {
 
   void finish() {
     if (TotalFixes > 0) {
-      Rewriter Rewrite(SourceMgr, LangOpts);
+      bool AnyNotWritten = false;
       for (const auto &FileAndReplacements : FileReplacements) {
+        Rewriter Rewrite(SourceMgr, LangOpts);
         StringRef File = FileAndReplacements.first();
+        Files.getVirtualFileSystem().setCurrentWorkingDirectory(
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PiotrZSL wrote:

maybe would be nice to restore CurrentWorkingDirectory after this function come to the end.

https://github.com/llvm/llvm-project/pull/67839