Jeff King <> writes:

> Since the point of marking the detached HEAD is to turn off things like
> "@{-1}@{u}", we would want to be generous and err on the side of
> assuming it is a branch if it _might_ be one.

I am not sure X and Y mesh well in your "Since X, we would want Y".
It seems to argue for erring on the side of detached HEAD to me.

Checking the "from" name $HEX against old_sha1 is a local and cheap
measure I added there for the first level of disambiguation.  If
they do not match, we _know_ we didn't come back from a detached
HEAD state.

In order to err on the "favor branch when it could have been one",
you could additionally look for the reflog .git/logs/refs/heads/$HEX
when the "from" name $HEX matches old_sha1 (which is likely to be
detached, but it is possible that we were on the $HEX branch when
its tip was at $HEX) and making sure the tip of that $HEX branch
once used to be at $HEX at the time recorded for @{-N} in the HEAD
reflog in question.

That is far more expensive, though; I doubt it is worth doing.
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