<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/65643>65643</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            git-clang-format removes unstaged files
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang-format,
            new issue
      </td>
    </tr>

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

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

<pre>
    Hi all, 
While running `git clang-format` I have come to a scenario where the script doesn't work as expected.

## How to reproduce
1. Have staged changes in file `A` which require reformatting
2. Have staged changes in file `B` which don’t require reformatting
3. Have unstaged changes in file `B` which are actual changes (let’s say new function)
4. Run `git clang-format --staged`

**The effect**:    
- Unstaged changes in `A` which is the format change.
- New changes in file `B` are deleted. <- this is the wrong behavior

## Additional info

2. The version of the `clang-format` and the script is 16.0.6
3. I am running this on MacOs

If the changes that need formatting are staged in `B` and anything else is not staged in `B` then the `git-clang-format` refuses to format and prints a message saying that there are unstaged changes.

</pre>
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