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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  $ cat >> $HGRCPATH << EOF

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  > [extensions]

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  > absorb=

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  > drawdag=$TESTDIR/drawdag.py

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  > EOF

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  $ hg init

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  $ hg debugdrawdag <<'EOS'

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  > C

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  > |

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  > B

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  > |

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  > A

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  > EOS

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  $ hg phase -r A --public -q

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  $ hg phase -r C --secret --force -q

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  $ hg update C -q

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  $ printf B1 > B

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  $ hg absorb -aq

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  $ hg log -G -T '{desc} {phase}'

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  @  C secret

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  |

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  o  B draft

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  |

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  o  A public

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