streamclone: stop listing files for entries that have no volatile files This will save a lot of python related time. This significantly boost performance. The following number comes from a large private repository using perf::stream-locked-section: base-line: 35.04 seconds prev-change: 24.51 seconds (-30%) prev-change: 20.88 seconds (-40%) prev-change: 14.22 seconds (-60%) this-change: 11.58 seconds (-67% from baseline; -18% from prev)

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  $ hg init

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  $ echo 123 > a

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  $ hg add a

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  $ hg commit -m "first" a

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  $ mkdir sub

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  $ echo 321 > sub/b

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  $ hg add sub/b

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  $ hg commit -m "second" sub/b

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  $ cat sub/b

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  321

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  $ hg co 0

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  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

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  $ cat sub/b 2>/dev/null || echo "sub/b not present"

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  sub/b not present

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  $ test -d sub || echo "sub not present"

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  sub not present

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