On Thu, Feb 22, 2024 at 12:22:52PM -0500, Jeff King wrote:

If none of this makes sense, it is because I am only now untangling what
is going on with 6436a20284. ;) I will try to polish my proposed patches
and hopefully that will explain it a bit more clearly (I may not get to
it until tomorrow though).

OK, so here's what I came up with. One thing I did not realize, as I
was writing my patches directly atop 6436a20284, is that we actually
fixed the reflog message bug back in f2463490c4 (show-branch: show
reflog message, 2021-12-02). And several tests have been added since
then.

So I gave up on trying to build on top of the source of the bug, and
just rebased onto the tip of master. It should apply to recent "maint"
as well, I'd think.

  [1/3]: Revert "refs: allow @{n} to work with n-sized reflog"
  [2/3]: get_oid_basic(): special-case ref@{n} for oldest reflog entry
  [3/3]: read_ref_at(): special-case ref@{0} for an empty reflog

 object-name.c          |  9 ++++++
 refs.c                 | 65 +++++++++++++++++++-----------------------
 refs.h                 | 15 +++++++++-
 t/t3202-show-branch.sh | 49 +++++++++++++++++++++----------
 4 files changed, 87 insertions(+), 51 deletions(-)