match: strengthen visit_children_set invariant, Recursive means "all files" My previous interpretation of "Recursive" was too relaxed: I thought it instructed the caller to do something like this: > you can stop calling `visit_children_set` because you'll need to descend into > every directory recursively, but you should still check every file if it > matches or not Whereas the real instruction seems to be: > I guarantee that everything in this subtree matches, you can stop > querying the matcher for all files and dirs altogether. The evidence to support this: - the test actually passes with the stronger invariant, revealing no exceptions from this rule - the implementation of `visit_children_set` for `DifferenceMatcher` clearly relies on this requirement, so it must hold for that not to lead to bugs.

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from mercurial.utils import procutil

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# XXX: we should probably offer a devel option to do this in blackbox directly

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def getuser():

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    return b'bob'

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def getpid():

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    return 5000

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# mock the date and user apis so the output is always the same

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def uisetup(ui):

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    procutil.getuser = getuser

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    procutil.getpid = getpid