.hgtags

phases: large rewrite on retract boundary

The new code is still pure Python, so we still have room to going significantly
faster. However its complexity of the complex part is `O(|[min_new_draft, tip]|)` instead of
`O(|[min_draft, tip]|` which should help tremendously one repository with old
draft (like mercurial-devel or mozilla-try).

This is especially useful as the most common "retract boundary" operation
happens when we commit/rewrite new drafts or when we push new draft to a
non-publishing server. In this case, the smallest new_revs is very close to the
tip and there is very few work to do.

A few smaller optimisation could be done for these cases and will be introduced in
later changesets.

We still have iterate over large sets of roots, but this is already a great
improvement for a very small amount of work. We gather information on the
affected changeset as we go as we can put it to use in the next changesets.
This extra data collection might slowdown the `register_new` case a bit, however
for register_new, it should not really matters. The set of new nodes is either
small, so the impact is negligible, or the set of new nodes is large, and the
amount of work to do to had them will dominate the overhead the collecting
information in `changed_revs`.

As this new code compute the changes on the fly, it unlock other interesting
improvement to be done in later changeset.

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05de4896508e8ec387b33eb30d8aab78d1c8e9e4 6.4rc0
f14864fffdcab725d9eac6d4f4c07be05a35f59a 6.4
83ea6ce48b4fd09fb79c4e34cc5750c805699a53 6.4.1
f952be90b0514a576dcc8bbe758ce3847faba9bb 6.4.2
fc445f8abcf90b33db7c463816a1b3560681767f 6.4.3
da372c745e0f053bb7a64e74cccd15810d96341d 6.4.4
271a4ab29605ffa0bae5d3208eaa21a95427ff92 6.4.5
bb42988c7e156931b0ff1e93732b98173ebbcb7f 6.5rc0
3ffc7209bbae5804a53084c9dc2d41139e88c867 6.5
787af4e0e8b787e1b77a8059926b123730a4cd01 6.5.1
5a8b5420103937fca97c584c5162178eed828ada 6.5.2
c083d9776cb2fb6056715b2988d1ea48055f3162 6.5.3
27055614b68538576fb0439007009acf93fe0a49 6.6rc0
26c57e7a0890b96e2c473b394de380d6753c9230 6.6
71bd09bebbe36a09569cbfb388f371433360056b 6.6.1
136902b3a95db38854ebaf5198a627641065c2ea 6.6.2
3fd1efb3ad124e6686c0fb66e6943cd8aeea5681 6.6.3