branchcache: allow to detect "pure topological case" for branchmap We don't rum this detection every time we run the branchcache, that would be costly. However we now do it when running `hg debugupdatecache`. This will help existing repository to benefit from the fastpath when possible.

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To run the tests, do:

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cd tests/

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python run-tests.py

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See https://mercurial-scm.org/wiki/WritingTests for

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more information on writing tests.