[clang-format] Unnecessary space added before // clang-format on which disables formatting

[mkurdej]

Using LLVM style, and given input:

// clang-format off
//comment
// clang-format on
int      unformatted;

clang-format adds a space before clang-format on:

// clang-format off
//comment
//  clang-format on
int unformatted;

So the line int unformatted; gets formatted this time but next time, // clang-format on does not enable the formatting and any code futher down is not formatted anymore.
E.g. if know I change the code to:

// clang-format off
//comment
//  clang-format on
int         unformatted_again;

it will stay as is (because of this additional space in // clang-format on).

[llvmbot]

@llvm/issue-subscribers-bug

[llvmbot]

@llvm/issue-subscribers-clang-format

[mkurdej]

That's a regression in clang-format 13. Version 12 was OK.

[mkurdej]

BTW, I thought that it could be worked around using:

SpacesInLineCommentPrefix:
  Minimum: 1
  Maximum: 1

but that doesn't change anything.

[penagos]

I've raised a review request for this at: https://reviews.llvm.org/D120188.
I believe this was a regression introduced by: https://reviews.llvm.org/D92257.