phases: avoid N² behavior in `advanceboundary` We allowed duplicated entries in the deque, which each entry could potentially insert all its ancestors. So advancing boundary for the full repository would mean each revision would walk all its ancestors, resulting in O(N²) iteration. For repository of any decent size, N² is quickly insane. We introduce a simple set to avoid this and get back to reasonable performance.

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#require execbit

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  $ hg init repo

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  $ cd repo

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  $ echo foo > foo

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  $ chmod 644 foo

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  $ hg ci -qAm '644'

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  $ chmod 755 foo

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  $ hg ci -qAm '755'

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reverting to rev 0

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  $ hg revert -a -r 0

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  reverting foo

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  $ hg st

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  M foo

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  $ hg diff --git

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  diff --git a/foo b/foo

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  old mode 100755

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  new mode 100644

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  $ cd ..