evolve: make sure divergence resolution doesn't undo changes (issue6203)
Before this patch, in content-divergence resolution logic if resolution
parent is not the parent of any of the two divergent changesets then
it could undo some changes introduced by previous revs (while resolving
stack of content-divergent changesets) as demonstrated by the test added in
previous patch.
To solve this, what this patch doing is: if divergent cset has obsolete
parent with a successor then first resolve the "orphan" instability of
divergent cset by relocating, then perform the content-divergence resolution.
After this change in logic, I found that it's kind of more correct as
reflected by the changes in tests/test-evolve-content-divergent-corner-cases.t
where it prevented creating conflicts while merging.
Changes in tests/test-evolve-content-divergent-stack.t demonstrate the fixed
behaviour.
Next patches will be covering the `evolve --continue` case for the relocation
of "divergent" cset.
Set up some configs
$ cat >> $HGRCPATH <<EOF
> [extensions]
> rebase=
> EOF
$ echo "evolve=$(echo $(dirname $TESTDIR))/hgext3rd/evolve/" >> $HGRCPATH
Test listing orphan changesets
$ hg init r2
$ cd r2
$ echo a > a && hg ci -Am a
adding a
$ echo b > b && hg ci -Am b
adding b
$ echo c > c && hg ci -Am c
adding c
$ hg up 0
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
$ echo a >> a && hg ci --amend -m a
2 new orphan changesets
$ hg evolve --list
d2ae7f538514: b
orphan: cb9a9f314b8b (obsolete parent)
177f92b77385: c
orphan: d2ae7f538514 (orphan parent)
$ cd ..
Test listing phase-divergent changesets
$ hg init r3
$ cd r3
$ echo a > a && hg ci -Am a
adding a
$ echo b > b && hg ci --amend -m ab
$ hg phase --public --rev 0 --hidden
1 new phase-divergent changesets
$ hg evolve --list
88cc282e27fc: ab
phase-divergent: cb9a9f314b8b (immutable precursor)
$ cd ..
Test listing content-divergent changesets
$ hg init r1
$ cd r1
$ echo a > a && hg ci -Am a
adding a
$ hg up 0
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo b > b && hg ci -Am b
adding b
$ hg up 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo c > c && hg ci -Am c
adding c
created new head
$ hg up 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo d > d && hg ci -Am d
adding d
created new head
$ hg rebase -s 1 -d 2
rebasing 1:d2ae7f538514 "b"
$ hg rebase -s 1 -d 3 --hidden --config experimental.allowdivergence=True
rebasing 1:d2ae7f538514 "b"
2 new content-divergent changesets
$ hg evolve --list
c882616e9d84: b
content-divergent: a922b3733e98 (draft) (precursor d2ae7f538514)
a922b3733e98: b
content-divergent: c882616e9d84 (draft) (precursor d2ae7f538514)
$ hg evolve --list --rev c882616e9d84
c882616e9d84: b
content-divergent: a922b3733e98 (draft) (precursor d2ae7f538514)
$ hg phase -p a922b3733e98
$ hg evolve --list
c882616e9d84: b
content-divergent: a922b3733e98 (public) (precursor d2ae7f538514)
$ cd ..