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)

date: updated on both side to the same value

  $ 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
  | |    rewritten(content) as 1d1fc409af98 using amend by test (Thu Jan 01 00:00:00 1970 +0000)
  | |
  x |  0065551bd38f (2) add foo.txt
  |/     rewritten(content) as a25dd7af6cf6 using amend by test (Thu Jan 01 00:00:00 1970 +0000)
  |
  x  cc71ffbc7c00 (1) add foo.txt
       rewritten(date) as 0065551bd38f using metaedit by test (Thu Jan 01 00:00:00 1970 +0000)
       rewritten(date) as c17bf400a278 using metaedit by test (Thu Jan 01 00:00:00 1970 +0000)
  
  $ hg evolve --list --rev .
  08bc7ba82799: add foo.txt
    content-divergent: c17bf400a278 (draft) (precursor cc71ffbc7c00)
  
  $ hg log --hidden -r cc71ffbc7c00 -T '{rev} {node|short} {date|isodate}: {join(obsfate, "; ")}\n'
  1 cc71ffbc7c00 1970-01-01 00:00 +0000: date-changed using metaedit as 4:c17bf400a278; date-changed using metaedit as 2:0065551bd38f
  $ hg log -r 'desc("add foo.txt")' -T '{rev} {node|short} {date|isodate}: {join(obsfate, "; ")}\n'
  4 c17bf400a278 1969-12-31 23:59 -0000: 
  6 08bc7ba82799 1969-12-31 23:59 -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 2372e6d39855
  $ hg log -r 'desc("add foo.txt")' -T '{rev} {node|short} {date|isodate}: {join(obsfate, "; ")}\n'
  4 c17bf400a278 1969-12-31 23:59 -0000: rewritten using evolve as 7:2372e6d39855
  7 2372e6d39855 1970-01-01 00:00 +0000: 
  7 bb2424887202 1969-12-31 23:59 +0000: (false !)

date: updated one one side to an older value

  $ hg evolve -r .
  move:[7] add foo.txt
  atop:[0] add r0
  working directory is now at 2b9788beff53
  $ hg update --hidden --rev 'predecessors(.)'
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updated to hidden changeset 2372e6d39855
  (hidden revision '2372e6d39855' was rewritten as: 2b9788beff53)
  working directory parent is obsolete! (2372e6d39855)
  (use 'hg evolve' to update to its successor: 2b9788beff53)
  $ hg amend --date "0 2"
  1 new orphan changesets
  2 new content-divergent changesets
  $ hg rebase -r . -d 0
  rebasing 9:88085147662e "add foo.txt" (tip)
  $ hg log -G
  @  changeset:   10:873d828420d8
  |  tag:         tip
  |  parent:      0:a24ed8ad918c
  |  user:        test
  |  date:        Wed Dec 31 23:59:58 1969 -0000
  |  instability: content-divergent
  |  summary:     add foo.txt
  |
  | *  changeset:   8:2b9788beff53
  |/   parent:      0:a24ed8ad918c
  |    user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +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 evolve --list -r .
  873d828420d8: add foo.txt
    content-divergent: 2b9788beff53 (draft) (precursor 2372e6d39855)
  
  $ hg log -r 2372e6d39855+873d828420d8+2b9788beff53 --hidden -T '{rev} {node|short} {date|isodate}: {join(obsfate, "; ")}\n'
  7 2372e6d39855 1970-01-01 00:00 +0000: date-changed using amend as 9:88085147662e; rebased using evolve as 8:2b9788beff53
  10 873d828420d8 1969-12-31 23:59 -0000: 
  8 2b9788beff53 1970-01-01 00:00 +0000: 
  $ hg evolve --content-divergent
  merge:[8] add foo.txt
  with: [10] add foo.txt
  base: [7] add foo.txt
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  working directory is now at bb2424887202
  $ hg log -r . --hidden -T '{rev} {node|short} {date|isodate}: {join(obsfate, "; ")}\n'
  11 bb2424887202 1970-01-01 00:00 +0000: 
  11 bb2424887202 1969-12-31 23:59 +0000: (false !)

date: updated one side to an newer value

  $ hg update --hidden --rev 'predecessors(.)'
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updated to hidden changeset 873d828420d8
  (hidden revision '873d828420d8' was rewritten as: bb2424887202)
  working directory parent is obsolete! (873d828420d8)
  (use 'hg evolve' to update to its successor: bb2424887202)
  $ hg amend --date "120 0"
  2 new content-divergent changesets
  $ hg log -G
  @  changeset:   12:902e190ef559
  |  tag:         tip
  |  parent:      0:a24ed8ad918c
  |  user:        test
  |  date:        Thu Jan 01 00:02:00 1970 +0000
  |  instability: content-divergent
  |  summary:     add foo.txt
  |
  | *  changeset:   11:bb2424887202
  |/   parent:      0:a24ed8ad918c
  |    user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +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 evolve --list -r .
  902e190ef559: add foo.txt
    content-divergent: bb2424887202 (draft) (precursor 873d828420d8)
  
  $ hg up bb2424887202
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg log -r 873d828420d8+bb2424887202+902e190ef559 --hidden -T '{rev} {node|short} {date|isodate}: {join(obsfate, "; ")}\n'
  10 873d828420d8 1969-12-31 23:59 -0000: date-changed using evolve as 11:bb2424887202; date-changed using amend as 12:902e190ef559
  11 bb2424887202 1970-01-01 00:00 +0000: 
  12 902e190ef559 1970-01-01 00:02 +0000: 
  $ hg evolve --content-divergent
  merge:[11] add foo.txt
  with: [12] add foo.txt
  base: [10] add foo.txt
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  nothing changed
  $ hg log -r . --hidden -T '{rev} {node|short} {date|isodate}: {join(obsfate, "; ")}\n'
  11 bb2424887202 1970-01-01 00:00 +0000: 
  13 bb2424887202 1970-01-01 00:02 +0000: (false !)

date: updated each side to a different value, newer should win

  $ hg amend --date "235 0"
  $ hg update --hidden --rev 'predecessors(.)'
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updated to hidden changeset bb2424887202
  (hidden revision 'bb2424887202' was rewritten as: 48132e92d706)
  working directory parent is obsolete! (bb2424887202)
  (use 'hg evolve' to update to its successor: 48132e92d706)
  $ hg amend --date "784 0"
  2 new content-divergent changesets
  $ hg log -G
  @  changeset:   14:694c3cf6b929
  |  tag:         tip
  |  parent:      0:a24ed8ad918c
  |  user:        test
  |  date:        Thu Jan 01 00:13:04 1970 +0000
  |  instability: content-divergent
  |  summary:     add foo.txt
  |
  | *  changeset:   13:48132e92d706
  |/   parent:      0:a24ed8ad918c
  |    user:        test
  |    date:        Thu Jan 01 00:03:55 1970 +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 evolve --list -r .
  694c3cf6b929: add foo.txt
    content-divergent: 48132e92d706 (draft) (precursor bb2424887202)
  
  $ hg log -r bb2424887202+48132e92d706+694c3cf6b929 --hidden -T '{rev} {node|short} {date|isodate}: {join(obsfate, "; ")}\n'
  11 bb2424887202 1970-01-01 00:00 +0000: date-changed using amend as 14:694c3cf6b929; date-changed using amend as 13:48132e92d706
  13 48132e92d706 1970-01-01 00:03 +0000: 
  14 694c3cf6b929 1970-01-01 00:13 +0000: 
  $ hg evolve --content-divergent
  merge:[13] add foo.txt
  with: [14] add foo.txt
  base: [12] add foo.txt
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  working directory is now at a24ed8ad918c
  $ hg log -r . --hidden -T '{rev} {node|short} {date|isodate}: {join(obsfate, "; ")}\n'
  0 a24ed8ad918c 1970-01-01 00:00 +0000: 
  16 bb2424887202 1970-01-01 00:13 +0000: (false !)