phases: invalidate the phases set less often on retract boundary
We already have the information to update the phase set, so we do so directly
instead of invalidating the cache.
This show a sizeable speedup in our `perf::unbundle` benchmark on the
many-draft mozilla-try repository.
### data-env-vars.name = mozilla-try-2023-03-22-zstd-sparse-revlog
# benchmark.name = hg.perf.perf-unbundle
# bin-env-vars.hg.flavor = no-rust
# bin-env-vars.hg.py-re2-module = default
# benchmark.variants.
issue6528 = disabled
# benchmark.variants.revs = last-10
before: 2.055259 seconds
after: 1.887064 seconds (-8.18%)
# benchmark.variants.revs = last-100
before: 2.409239 seconds
after: 2.222429 seconds (-7.75%)
# benchmark.variants.revs = last-1000
before: 3.945648 seconds
after: 3.762480 seconds (-4.64%)
#!/usr/bin/env python3
#
# An example hgweb CGI script, edit as necessary
# See also https://mercurial-scm.org/wiki/PublishingRepositories
# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = b"/path/to/repo/or/config"
# Uncomment and adjust if Mercurial is not installed system-wide
# (consult "installed modules" path from 'hg debuginstall'):
# import sys; sys.path.insert(0, "/path/to/python/lib")
from mercurial import demandimport
demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi
application = hgweb(config)
wsgicgi.launch(application)