<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/63379>63379</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang-format] Ignores "clang-format off" for preprocessor directives in main branch (llvm 17)
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          Sedeniono
      </td>
    </tr>
</table>

<pre>
    Consider
```C++
// clang-format off
#if 0
        #if SHOULD_STAY_INDENTED
 #endif
#endif
// clang-format on
```
The `.clang-format` file contains a single line:
```
BasedOnStyle: LLVM
```
Formatting the whole file with clang 16, the formatting of the preprocessor directives is not changed. However, using the current main branch (llvm 17; specifically b7287a82d33b6cd1760ac7e399ba92ae52057b5d), clang-format does format the `#if SHOULD_STAY_INDENTED` and the `#endif` (the indent gets removed).
This happens even with the bugfix from #62892.

I could bisect it to a4c87f8ccaccc76fd7d1c6c2e639ca84b9ec7794 (#61498). Differential revision: https://reviews.llvm.org/D150057
Maybe @owenca?

I noticed the above regression while looking at the example from https://github.com/llvm/llvm-project/issues/57117, and managed to reduce it to the above.
</pre>
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