branchcache: pass the target repository when copying Branchmap are usually copied to be used on a different repoview using a different filter level. Passing the repository around means the repository in `branchcache._repo` will drift from the actual branchmap filter. This is currently "fine" because the repo is only used to retrieve the `nullid` value. However, this is a fairly big trap for any extension or future code using the `_repo` attribute. The replace logic is now using a copy to ensure the right repository view is used to initialized the cached value. We add a couple of assert for make sure this inconsistency does not sneak back.

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[build-system]

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requires = ["setuptools", "wheel"]

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[tool.black]

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line-length = 80

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exclude = '''

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build/

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| wheelhouse/

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| dist/

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| packages/

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| \.hg/

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| \.mypy_cache/

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| \.venv/

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| mercurial/thirdparty/

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'''

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skip-string-normalization = true

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quiet = true