`clang-format` oscillates formatting of `// clang-format off`

clang-format oscillates between two different choices for how to format the following minimal example. It will continuously reformat its own output. Here is the relevant .clang-format:

---
Language:        Cpp
BasedOnStyle:  Google
ReflowComments: false

And here is a minimal example in C++ to reproduce this.

void func() {
  // clang-format off
  #define KV(value) #value, value
  // clang-format on
}

Running clang-format against this produces the result:

void func() {
// clang-format off
  #define KV(value) #value, value
  // clang-format on
}

But running clang-format again on that output re-formats it back to the original code (i.e. it adds the indentation back before the comment). I have tested this against clang-format 16.0.1 and 12.0.0, and am able to reproduce the bug with both.

[llvmbot]

@llvm/issue-subscribers-clang-format

[owenca]

https://reviews.llvm.org/D148200