Re: [DOC] merge-file: document that merge.conflictStyle requires a repository

[Junio C Hamano <gitster@pobox.com>]

Yannik Tausch <dev@ytausch.de> writes:

> We noticed that `git merge-file` only respects the `merge.conflictStyle`
> configuration when run inside a repository. Outside a repository, the
> setting is ignored and only the `--diff3`/`--zdiff3` flags work.
>
> Looking at the history, this appears to be intentional since b541248467
> ("merge.conflictstyle: choose between merge and diff3 -m styles", 2008),
> which explicitly gates config reading on being inside a repository.
>
> This behavior surprised me, and I couldn't find it documented anywhere.
> Would a small documentation patch to git-merge-file.txt be welcome,
> noting that the config is only read when inside a repository?

Or even better, teach the command to read (limited set of)
configuration files.

By definition, you cannot read from per-repository configuration
file when working outside a repository, but these days we let our
commands read configuration from system and personal configuration
files, I think.  Back in 2008, it is understandable we couldn't.