phases: update the phase set as we go during retract boundary Apparently iterating over the `changed_revs` dictionary is very expensive. On mozilla-try-2019-02-18, a perf::unbundle call with a 10 000 changesets bundle gives give use the following timing. e57d4b868a3e: 4.6 seconds ac1c75188440: 102.5 seconds prev-changeset: 30.0 seconds this-changeset: 4.6 seconds So, the performance regression is gone. Once again: thanks to marvelous Python!

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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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