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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fixbundle() {

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    grep -v 'saving bundle' | grep -v 'saved backup' | \

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        grep -v added | grep -v adding | \

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        grep -v "unable to find 'e' for patching" | \

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        grep -v "e: No such file or directory" | \

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    cat

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}