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Re: [PATCH 8/9] submodule.c: fetch in submodules git directory instead of in worktree

> Keep the properties introduced in 10f5c52656 (submodule: avoid
> auto-discovery in prepare_submodule_repo_env(), 2016-09-01), by fixating
> the git directory of the submodule.

This is to avoid the autodetection of the Git repository, making it less
error-prone; looks good to me.