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!
Do not strip innocent children. See https://bitbucket.org/facebook/hg-experimental/issues/6/hg-absorb-merges-diverged-commits
$ cat >> $HGRCPATH << EOF
> [extensions]
> absorb=
> drawdag=$TESTDIR/drawdag.py
> EOF
$ hg init
$ hg debugdrawdag << EOF
> E
> |
> D F
> |/
> C
> |
> B
> |
> A
> EOF
$ hg up E -q
$ echo 1 >> B
$ echo 2 >> D
$ hg absorb -a
warning: orphaned descendants detected, not stripping 112478962961, 26805aba1e60
saved backup bundle to * (glob)
2 of 2 chunk(s) applied
$ hg log -G -T '{desc}'
@ E
|
o D
|
o C
|
o B
|
| o F
| |
| o C
| |
| o B
|/
o A