Re: [PATCH v2 0/3] Teach git-diff-tree(1) option --max-depth

> Changes in v2:
> - Added unit-tests for within_depth() in dir.c. Originally the patch
>   was a oneline change by Peff, but I've added a bunch of code and
>   extended the commit message, so I've set myself as the author and set
>   a Based-on-patch-by trailer for Peff. I hope that's okay?
> - Added support for --max-depth=-1 and extended code comments why we
>   need the max_depth_valid flag. With these modification it did no
>   longer feel appropriate to keep Peff's Signed-off-by trailer.
> - Made die() messages translatable.
> - Small tweaks to the docs.
> - Added some const-correctness.
> - Switched from `die("BUG: ...")` to `BUG(...)`.
> - Link to v1: https://lore.kernel.org/r/20250729-toon-max-depth-v1-0-c177e39c40fb@iotcl.com