https://bz.mercurial-scm.org/672

# 0-2-4

#  \ \ \

#   1-3-5

#

# rename in #1, content change in #4.

  $ hg init

  $ touch 1

  $ touch 2

  $ hg commit -Am init  # 0

  adding 1

  adding 2

  $ hg rename 1 1a

  $ hg commit -m rename # 1

  $ hg co -C 0

  1 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ echo unrelated >> 2

  $ hg ci -m unrelated1 # 2

  created new head

  $ hg merge --debug 1

    unmatched files in other:

     1a

    all copies found (* = to merge, ! = divergent, % = renamed and deleted):

     src: '1' -> dst: '1a' 

    checking for directory renames

  resolving manifests

   branchmerge: True, force: False, partial: False

   ancestor: 81f4b099af3d, local: c64f439569a9+, remote: c12dcd37c90a

   1: other deleted -> r

  removing 1

   1a: remote created -> g

  getting 1a

  1 files updated, 0 files merged, 1 files removed, 0 files unresolved

  (branch merge, don't forget to commit)

  $ hg ci -m merge1 # 3

  $ hg co -C 2

  1 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ echo hello >> 1

  $ hg ci -m unrelated2 # 4

  created new head

  $ hg co -C 3

  1 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ hg merge -y --debug 4

    unmatched files in local:

     1a

    all copies found (* = to merge, ! = divergent, % = renamed and deleted):

     src: '1' -> dst: '1a' *

    checking for directory renames

  resolving manifests

   branchmerge: True, force: False, partial: False

   preserving 1a for resolve of 1a

  starting 4 threads for background file closing (?)

   1a: local copied/moved from 1 -> m (premerge)

  picked tool ':merge' for 1a (binary False symlink False changedelete False)

  merging 1a and 1 to 1a

   premerge successful

  0 files updated, 1 files merged, 0 files removed, 0 files unresolved

  (branch merge, don't forget to commit)

  $ hg co -C 4

  1 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ hg merge -y --debug 3

    unmatched files in other:

     1a

    all copies found (* = to merge, ! = divergent, % = renamed and deleted):

     src: '1' -> dst: '1a' *

    checking for directory renames

  resolving manifests

   branchmerge: True, force: False, partial: False

   preserving 1 for resolve of 1a

  removing 1

  starting 4 threads for background file closing (?)

   1a: remote moved from 1 -> m (premerge)

  picked tool ':merge' for 1a (binary False symlink False changedelete False)

  merging 1 and 1a to 1a

   premerge successful

  0 files updated, 1 files merged, 0 files removed, 0 files unresolved

  (branch merge, don't forget to commit)