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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https://bz.mercurial-scm.org/1089

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  $ hg init repo

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  $ cd repo

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  $ mkdir a

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  $ echo a > a/b

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  $ hg ci -Am m

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  adding a/b

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  $ hg rm a

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  removing a/b

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  $ hg ci -m m a

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  $ mkdir a b

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  $ echo a > a/b

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  $ hg ci -Am m

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  adding a/b

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  $ hg rm a

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  removing a/b

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  $ cd b

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Relative delete:

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  $ hg ci -m m ../a

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  $ cd ..