stablerange: compute subranges from parent when possible Unless we are a merge, we can infer the standard subranges of a range by reusing the subranger of its parent. We update the implementation to do so. We still needs the "old way" for merge. We move that code in a dedicated function for the sake of simplicity.

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#require test-repo pyflakes

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Copied from Mercurial core (60ee2593a270)

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  $ cd "`dirname "$TESTDIR"`"

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run pyflakes on all tracked files ending in .py or without a file ending

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(skipping binary file random-seed)

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  $ hg locate 'set:(**.py or grep("^#!.*python")) - removed()' 2>/dev/null \

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  > | xargs pyflakes 2>/dev/null