[Bug 6141] New: Evolving a merge switches parents

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=6141

            Bug ID: 6141
           Summary: Evolving a merge switches parents
           Product: Mercurial
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: bug
          Priority: wish
         Component: evolution
          Assignee: bugzilla at mercurial-scm.org
          Reporter: me at manueljacob.de
                CC: mercurial-devel at mercurial-scm.org,
                    pierre-yves.david at ens-lyon.org

At the end you can see that the parents of changeset 'merge' are switched.

% hg init && 
  touch test1 test2 &&
  hg add test1 test2 &&
  hg ci -m base &&
  echo a > test1 &&
  hg ci -m left &&
  hg up 0 &&
  echo b > test2 &&
  hg ci -m right &&
  hg up 1 &&
  hg merge 2 && 
  hg ci -m merge
created new head
(consider using topic for lightweight branches. See 'hg help topic')
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
% hg log -G
@    changeset:   3:6d4b04b82efe
|\   tag:         tip
| |  parent:      1:1dce335b603a
| |  parent:      2:611e09cde543
| |  user:        test
| |  date:        Fri May 17 20:08:34 2019 +0200
| |  summary:     merge
| |
| o  changeset:   2:611e09cde543
| |  parent:      0:48bd97148639
| |  user:        test
| |  date:        Fri May 17 20:08:34 2019 +0200
| |  summary:     right
| |
o |  changeset:   1:1dce335b603a
|/   user:        test
|    date:        Fri May 17 20:08:33 2019 +0200
|    summary:     left
|
o  changeset:   0:48bd97148639
   user:        test
   date:        Fri May 17 20:08:33 2019 +0200
   summary:     base

% hg up 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
% echo c > test2
% hg amend
1 new orphan changesets
% hg evolve
move:[3] merge
atop:[4] right
working directory is now at 4768cda43c54
% hg log -G     
@    changeset:   5:4768cda43c54
|\   tag:         tip
| |  parent:      4:e693f496e70e
| |  parent:      1:1dce335b603a
| |  user:        test
| |  date:        Fri May 17 20:08:34 2019 +0200
| |  summary:     merge
| |
| o  changeset:   4:e693f496e70e
| |  parent:      0:48bd97148639
| |  user:        test
| |  date:        Fri May 17 20:08:34 2019 +0200
| |  summary:     right
| |
o |  changeset:   1:1dce335b603a
|/   user:        test
|    date:        Fri May 17 20:08:33 2019 +0200
|    summary:     left
|
o  changeset:   0:48bd97148639
   user:        test
   date:        Fri May 17 20:08:33 2019 +0200
   summary:     base

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