manifests: push down expected node length into the parser This strictly enforces the node length in the manifest lines according to what the repository expects. One test case moves large hash testing into the non-treemanifest part as treemanifests don't provide an interface for overriding just the node length for now. Differential Revision: https://phab.mercurial-scm.org/D10533

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  $ hg init

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  $ echo a > a

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  $ hg ci -Am t

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  adding a

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  $ hg mv a b

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  $ hg ci -Am t1

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  $ hg debugrename b

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  b renamed from a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3

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  $ hg mv b a

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  $ hg ci -Am t2

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  $ hg debugrename a

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  a renamed from b:37d9b5d994eab34eda9c16b195ace52c7b129980

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  $ hg debugrename --rev 1 b

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  b renamed from a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3

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