Content divergence and trying to relocate a node on top of itself (issue5958)

https://bz.mercurial-scm.org/show_bug.cgi?id=5958

  $ . $TESTDIR/testlib/common.sh

  $ cat << EOF >> $HGRCPATH

  > [extensions]

  > rebase =

  > evolve =

  > EOF

  $ hg init issue5958

  $ cd issue5958

  $ echo hi > r0

  $ hg ci -qAm 'add r0'

  $ echo hi > foo.txt

  $ hg ci -qAm 'add foo.txt'

  $ hg metaedit -r . -d '0 2'

  0 files updated, 0 files merged, 0 files removed, 0 files unresolved

(Make changes in unrelated files so that we don't have any merge conflicts

during the rebase, but the two touched revisions aren't identical)

  $ echo hi > bar.txt

  $ hg add -q bar.txt

  $ hg amend -q

  $ hg metaedit -r 1 -d '0 1' --hidden

  2 new content-divergent changesets

  $ hg log -r tip

  changeset:   4:c17bf400a278

  tag:         tip

  parent:      0:a24ed8ad918c

  user:        test

  date:        Wed Dec 31 23:59:59 1969 -0000

  instability: content-divergent

  summary:     add foo.txt

  $ echo hi > baz.txt

  $ hg add -q baz.txt

  $ hg amend -q

  $ hg rebase -qr tip -d 4

  $ hg log -G

  @  changeset:   6:08bc7ba82799

  |  tag:         tip

  |  parent:      4:c17bf400a278

  |  user:        test

  |  date:        Wed Dec 31 23:59:58 1969 -0000

  |  instability: content-divergent

  |  summary:     add foo.txt

  |

  *  changeset:   4:c17bf400a278

  |  parent:      0:a24ed8ad918c

  |  user:        test

  |  date:        Wed Dec 31 23:59:59 1969 -0000

  |  instability: content-divergent

  |  summary:     add foo.txt

  |

  o  changeset:   0:a24ed8ad918c

     user:        test

     date:        Thu Jan 01 00:00:00 1970 +0000

     summary:     add r0

  $ hg obslog -a -r .

  @  08bc7ba82799 (6) add foo.txt

  |

  | *  c17bf400a278 (4) add foo.txt

  | |

  x |  1d1fc409af98 (5) add foo.txt

  | |    rewritten(parent, content) as 08bc7ba82799 using rebase by test (Thu Jan 01 00:00:00 1970 +0000)

  | |

  x |  a25dd7af6cf6 (3) add foo.txt

  | |    amended(content) as 1d1fc409af98 using amend by test (Thu Jan 01 00:00:00 1970 +0000)

  | |

  x |  0065551bd38f (2) add foo.txt

  |/     amended(content) as a25dd7af6cf6 using amend by test (Thu Jan 01 00:00:00 1970 +0000)

  |

  x  cc71ffbc7c00 (1) add foo.txt

       date-changed(date) as 0065551bd38f using metaedit by test (Thu Jan 01 00:00:00 1970 +0000)

       date-changed(date) as c17bf400a278 using metaedit by test (Thu Jan 01 00:00:00 1970 +0000)

  $ hg evolve --content-divergent

  merge:[6] add foo.txt

  with: [4] add foo.txt

  base: [1] add foo.txt

  0 files updated, 0 files merged, 0 files removed, 0 files unresolved

  1 new orphan changesets

  working directory is now at 459c64f7eaad