tests: split out separate test for issue5020

The test was added to the existing setup in 41f6af50c0d8 (merge: fix
crash on criss cross merge with dir move and delete (issue5020),
2017-01-31). I'm about to make a change that affects that test and
it's much easier to follow if the test case for issue5020 is a
separate test case. The separate test case is based on what mpm
provided in comment 12 on the issue.

`hg diff -r 41f6af50c0d8^ tests/test-merge-criss-cross.t` after this
patch is pretty small (besides the added test). It's probably easier
for reviewers to look at that than to try to understand the diff
itself (I don't understand it).

Differential Revision: https://phab.mercurial-scm.org/D6243

tests/test-merge-criss-cross.t

@@ -11,15 +11,9 b' Criss cross merging'
 
   $ hg up -qr0
   $ echo '2 first change' > f2
-  $ mkdir d1
-  $ echo '0 base' > d1/f3
-  $ echo '0 base' > d1/f4
-  $ hg add -q d1
   $ hg ci -qm '2 first change f2'
 
   $ hg merge -qr 1
-  $ hg rm d1/f3
-  $ hg mv -q d1 d2
   $ hg ci -m '3 merge'
 
   $ hg up -qr2
@@ -30,38 +24,38 b' Criss cross merging'
   $ hg ci -m '5 second change f1'
 
   $ hg up -r3
-  2 files updated, 0 files merged, 2 files removed, 0 files unresolved
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ echo '6 second change' > f2
   $ hg ci -m '6 second change f2'
 
   $ hg log -G
-  @  changeset:   6:6373bbfdae1d
+  @  changeset:   6:3b08d01b0ab5
   |  tag:         tip
-  |  parent:      3:c202c8af058d
+  |  parent:      3:cf89f02107e5
   |  user:        test
   |  date:        Thu Jan 01 00:00:00 1970 +0000
   |  summary:     6 second change f2
   |
-  | o  changeset:   5:e673248094b1
+  | o  changeset:   5:adfe50279922
   | |  user:        test
   | |  date:        Thu Jan 01 00:00:00 1970 +0000
   | |  summary:     5 second change f1
   | |
-  | o    changeset:   4:177f58377c06
-  | |\   parent:      2:d1d156401c1b
+  | o    changeset:   4:7d3e55501ae6
+  | |\   parent:      2:40663881a6dd
   | | |  parent:      1:0f6b37dbe527
   | | |  user:        test
   | | |  date:        Thu Jan 01 00:00:00 1970 +0000
   | | |  summary:     4 merge
   | | |
-  o---+  changeset:   3:c202c8af058d
-  | | |  parent:      2:d1d156401c1b
+  o---+  changeset:   3:cf89f02107e5
+  | | |  parent:      2:40663881a6dd
   |/ /   parent:      1:0f6b37dbe527
   | |    user:        test
   | |    date:        Thu Jan 01 00:00:00 1970 +0000
   | |    summary:     3 merge
   | |
-  | o  changeset:   2:d1d156401c1b
+  | o  changeset:   2:40663881a6dd
   | |  parent:      0:40494bf2444c
   | |  user:        test
   | |  date:        Thu Jan 01 00:00:00 1970 +0000
@@ -79,51 +73,27 b' Criss cross merging'
   
 
   $ hg merge -v --debug --tool internal:dump 5 --config merge.preferancestor='!'
-  note: using 0f6b37dbe527 as ancestor of 6373bbfdae1d and e673248094b1
-        alternatively, use --config merge.preferancestor=d1d156401c1b
+  note: using 0f6b37dbe527 as ancestor of 3b08d01b0ab5 and adfe50279922
+        alternatively, use --config merge.preferancestor=40663881a6dd
     searching for copies back to rev 3
-    unmatched files in local:
-     d2/f4
-    unmatched files in other:
-     d1/f3
-     d1/f4
-    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
-     src: 'd1/f4' -> dst: 'd2/f4' 
-    checking for directory renames
-     discovered dir src: 'd1/' -> dst: 'd2/'
-     pending file src: 'd1/f3' -> dst: 'd2/f3'
-     pending file src: 'd1/f4' -> dst: 'd2/f4'
   resolving manifests
    branchmerge: True, force: False, partial: False
-   ancestor: 0f6b37dbe527, local: 6373bbfdae1d+, remote: e673248094b1
-   preserving d2/f4 for resolve of d2/f4
+   ancestor: 0f6b37dbe527, local: 3b08d01b0ab5+, remote: adfe50279922
    preserving f2 for resolve of f2
    f1: remote is newer -> g
   getting f1
-   d2/f3: local directory rename - get from d1/f3 -> dg
-  getting d1/f3 to d2/f3
-   d2/f4: local directory rename, both created -> m (premerge)
    f2: versions differ -> m (premerge)
   picked tool ':dump' for f2 (binary False symlink False changedelete False)
   merging f2
-  my f2@6373bbfdae1d+ other f2@e673248094b1 ancestor f2@0f6b37dbe527
+  my f2@3b08d01b0ab5+ other f2@adfe50279922 ancestor f2@0f6b37dbe527
    f2: versions differ -> m (merge)
   picked tool ':dump' for f2 (binary False symlink False changedelete False)
-  my f2@6373bbfdae1d+ other f2@e673248094b1 ancestor f2@0f6b37dbe527
-  3 files updated, 0 files merged, 0 files removed, 1 files unresolved
+  my f2@3b08d01b0ab5+ other f2@adfe50279922 ancestor f2@0f6b37dbe527
+  1 files updated, 0 files merged, 0 files removed, 1 files unresolved
   use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
   [1]
 
-  $ f --dump --recurse *
-  d2: directory with 2 files
-  d2/f3:
-  >>>
-  0 base
-  <<<
-  d2/f4:
-  >>>
-  0 base
-  <<<
+  $ f --dump *
   f1:
   >>>
   5 second change
@@ -151,13 +121,11 b' Criss cross merging'
 
   $ hg up -qC .
   $ hg merge -v --tool internal:dump 5 --config merge.preferancestor="null 40663881 3b08d"
-  note: using 0f6b37dbe527 as ancestor of 6373bbfdae1d and e673248094b1
-        alternatively, use --config merge.preferancestor=d1d156401c1b
+  note: using 40663881a6dd as ancestor of 3b08d01b0ab5 and adfe50279922
+        alternatively, use --config merge.preferancestor=0f6b37dbe527
   resolving manifests
-  getting f1
-  getting d1/f3 to d2/f3
-  merging f2
-  3 files updated, 0 files merged, 0 files removed, 1 files unresolved
+  merging f1
+  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
   use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
   [1]
 
@@ -166,70 +134,36 b' Redo merge with merge.preferancestor="*"'
   $ rm f*
   $ hg up -qC .
   $ hg merge -v --debug --tool internal:dump 5 --config merge.preferancestor="*"
-  note: merging 6373bbfdae1d+ and e673248094b1 using bids from ancestors 0f6b37dbe527 and d1d156401c1b
+  note: merging 3b08d01b0ab5+ and adfe50279922 using bids from ancestors 0f6b37dbe527 and 40663881a6dd
   
   calculating bids for ancestor 0f6b37dbe527
     searching for copies back to rev 3
-    unmatched files in local:
-     d2/f4
-    unmatched files in other:
-     d1/f3
-     d1/f4
-    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
-     src: 'd1/f4' -> dst: 'd2/f4' 
-    checking for directory renames
-     discovered dir src: 'd1/' -> dst: 'd2/'
-     pending file src: 'd1/f3' -> dst: 'd2/f3'
-     pending file src: 'd1/f4' -> dst: 'd2/f4'
   resolving manifests
    branchmerge: True, force: False, partial: False
-   ancestor: 0f6b37dbe527, local: 6373bbfdae1d+, remote: e673248094b1
-   d2/f3: local directory rename - get from d1/f3 -> dg
-   d2/f4: local directory rename, both created -> m
+   ancestor: 0f6b37dbe527, local: 3b08d01b0ab5+, remote: adfe50279922
    f1: remote is newer -> g
    f2: versions differ -> m
   
-  calculating bids for ancestor d1d156401c1b
+  calculating bids for ancestor 40663881a6dd
     searching for copies back to rev 3
-    unmatched files in local:
-     d2/f4
-    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
-     src: 'd1/f4' -> dst: 'd2/f4' 
-    checking for directory renames
-     discovered dir src: 'd1/' -> dst: 'd2/'
   resolving manifests
    branchmerge: True, force: False, partial: False
-   ancestor: d1d156401c1b, local: 6373bbfdae1d+, remote: e673248094b1
+   ancestor: 40663881a6dd, local: 3b08d01b0ab5+, remote: adfe50279922
    f1: versions differ -> m
    f2: remote unchanged -> k
   
   auction for merging merge bids
-   d2/f3: consensus for dg
-   d2/f4: consensus for m
    f1: picking 'get' action
    f2: picking 'keep' action
   end of auction
   
-   preserving d2/f4 for resolve of d2/f4
    f1: remote is newer -> g
   getting f1
    f2: remote unchanged -> k
-   d2/f3: local directory rename - get from d1/f3 -> dg
-  getting d1/f3 to d2/f3
-   d2/f4: local directory rename, both created -> m (premerge)
-  3 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)
 
-  $ f --dump --recurse *
-  d2: directory with 2 files
-  d2/f3:
-  >>>
-  0 base
-  <<<
-  d2/f4:
-  >>>
-  0 base
-  <<<
+  $ f --dump *
   f1:
   >>>
   5 second change
@@ -243,79 +177,38 b' Redo merge with merge.preferancestor="*"'
 The other way around:
 
   $ hg up -C -r5
-  4 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg merge -v --debug --config merge.preferancestor="*"
-  note: merging e673248094b1+ and 6373bbfdae1d using bids from ancestors 0f6b37dbe527 and d1d156401c1b
+  note: merging adfe50279922+ and 3b08d01b0ab5 using bids from ancestors 0f6b37dbe527 and 40663881a6dd
   
   calculating bids for ancestor 0f6b37dbe527
     searching for copies back to rev 3
-    unmatched files in local:
-     d1/f3
-     d1/f4
-    unmatched files in other:
-     d2/f4
-    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
-     src: 'd1/f4' -> dst: 'd2/f4' 
-    checking for directory renames
-     discovered dir src: 'd1/' -> dst: 'd2/'
-     pending file src: 'd1/f3' -> dst: 'd2/f3'
-     pending file src: 'd1/f4' -> dst: 'd2/f4'
   resolving manifests
    branchmerge: True, force: False, partial: False
-   ancestor: 0f6b37dbe527, local: e673248094b1+, remote: 6373bbfdae1d
-   d2/f3: remote directory rename - move from d1/f3 -> dm
-   d2/f4: remote directory rename, both created -> m
+   ancestor: 0f6b37dbe527, local: adfe50279922+, remote: 3b08d01b0ab5
    f1: remote unchanged -> k
    f2: versions differ -> m
   
-  calculating bids for ancestor d1d156401c1b
+  calculating bids for ancestor 40663881a6dd
     searching for copies back to rev 3
-    unmatched files in other:
-     d2/f4
-    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
-     src: 'd1/f4' -> dst: 'd2/f4' 
-    checking for directory renames
-     discovered dir src: 'd1/' -> dst: 'd2/'
   resolving manifests
    branchmerge: True, force: False, partial: False
-   ancestor: d1d156401c1b, local: e673248094b1+, remote: 6373bbfdae1d
-   d1/f3: other deleted -> r
-   d1/f4: other deleted -> r
-   d2/f4: remote created -> g
+   ancestor: 40663881a6dd, local: adfe50279922+, remote: 3b08d01b0ab5
    f1: versions differ -> m
    f2: remote is newer -> g
   
   auction for merging merge bids
-   d1/f3: consensus for r
-   d1/f4: consensus for r
-   d2/f3: consensus for dm
-   d2/f4: picking 'get' action
    f1: picking 'keep' action
    f2: picking 'get' action
   end of auction
   
-   d1/f3: other deleted -> r
-  removing d1/f3
-   d1/f4: other deleted -> r
-  removing d1/f4
-   d2/f4: remote created -> g
-  getting d2/f4
    f2: remote is newer -> g
   getting f2
    f1: remote unchanged -> k
-  2 files updated, 0 files merged, 2 files removed, 0 files unresolved
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
 
-  $ f --dump --recurse *
-  d2: directory with 2 files
-  d2/f3:
-  >>>
-  0 base
-  <<<
-  d2/f4:
-  >>>
-  0 base
-  <<<
+  $ f --dump *
   f1:
   >>>
   5 second change
@@ -329,85 +222,57 b' Verify how the output looks and and how '
 
   $ hg up -qC
   $ hg merge
-  2 files updated, 0 files merged, 2 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 up -qC tip
   $ hg merge -v
-  note: merging 6373bbfdae1d+ and e673248094b1 using bids from ancestors 0f6b37dbe527 and d1d156401c1b
+  note: merging 3b08d01b0ab5+ and adfe50279922 using bids from ancestors 0f6b37dbe527 and 40663881a6dd
   
   calculating bids for ancestor 0f6b37dbe527
   resolving manifests
   
-  calculating bids for ancestor d1d156401c1b
+  calculating bids for ancestor 40663881a6dd
   resolving manifests
   
   auction for merging merge bids
-   d2/f3: consensus for dg
-   d2/f4: consensus for m
    f1: picking 'get' action
    f2: picking 'keep' action
   end of auction
   
   getting f1
-  getting d1/f3 to d2/f3
-  3 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 up -qC
   $ hg merge -v --debug --config merge.preferancestor="*"
-  note: merging 6373bbfdae1d+ and e673248094b1 using bids from ancestors 0f6b37dbe527 and d1d156401c1b
+  note: merging 3b08d01b0ab5+ and adfe50279922 using bids from ancestors 0f6b37dbe527 and 40663881a6dd
   
   calculating bids for ancestor 0f6b37dbe527
     searching for copies back to rev 3
-    unmatched files in local:
-     d2/f4
-    unmatched files in other:
-     d1/f3
-     d1/f4
-    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
-     src: 'd1/f4' -> dst: 'd2/f4' 
-    checking for directory renames
-     discovered dir src: 'd1/' -> dst: 'd2/'
-     pending file src: 'd1/f3' -> dst: 'd2/f3'
-     pending file src: 'd1/f4' -> dst: 'd2/f4'
   resolving manifests
    branchmerge: True, force: False, partial: False
-   ancestor: 0f6b37dbe527, local: 6373bbfdae1d+, remote: e673248094b1
-   d2/f3: local directory rename - get from d1/f3 -> dg
-   d2/f4: local directory rename, both created -> m
+   ancestor: 0f6b37dbe527, local: 3b08d01b0ab5+, remote: adfe50279922
    f1: remote is newer -> g
    f2: versions differ -> m
   
-  calculating bids for ancestor d1d156401c1b
+  calculating bids for ancestor 40663881a6dd
     searching for copies back to rev 3
-    unmatched files in local:
-     d2/f4
-    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
-     src: 'd1/f4' -> dst: 'd2/f4' 
-    checking for directory renames
-     discovered dir src: 'd1/' -> dst: 'd2/'
   resolving manifests
    branchmerge: True, force: False, partial: False
-   ancestor: d1d156401c1b, local: 6373bbfdae1d+, remote: e673248094b1
+   ancestor: 40663881a6dd, local: 3b08d01b0ab5+, remote: adfe50279922
    f1: versions differ -> m
    f2: remote unchanged -> k
   
   auction for merging merge bids
-   d2/f3: consensus for dg
-   d2/f4: consensus for m
    f1: picking 'get' action
    f2: picking 'keep' action
   end of auction
   
-   preserving d2/f4 for resolve of d2/f4
    f1: remote is newer -> g
   getting f1
    f2: remote unchanged -> k
-   d2/f3: local directory rename - get from d1/f3 -> dg
-  getting d1/f3 to d2/f3
-   d2/f4: local directory rename, both created -> m (premerge)
-  3 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)
 
 Test the greatest common ancestor returning multiple changesets
@@ -418,7 +283,7 b' Test the greatest common ancestor return'
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     1 first change f1
   
-  changeset:   2:d1d156401c1b
+  changeset:   2:40663881a6dd
   parent:      0:40494bf2444c
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000
@@ -513,3 +378,90 b' Verify that the old context ancestor wor'
   2
 
   $ cd ..
+
+  $ hg init issue5020
+  $ cd issue5020
+
+  $ echo a > noop
+  $ hg ci -qAm initial
+
+  $ echo b > noop
+  $ hg ci -qAm 'uninteresting change'
+
+  $ hg up -q 0
+  $ mkdir d1
+  $ echo a > d1/a
+  $ echo b > d1/b
+  $ hg ci -qAm 'add d1/a and d1/b'
+
+  $ hg merge -q 1
+  $ hg rm d1/a
+  $ hg mv -q d1 d2
+  $ hg ci -qm 'merge while removing d1/a and moving d1/b to d2/b'
+
+  $ hg up -q 1
+  $ hg merge -q 2
+  $ hg ci -qm 'merge (no changes while merging)'
+  $ hg log -G -T '{rev}:{node|short} {desc}'
+  @    4:c0ef19750a22 merge (no changes while merging)
+  |\
+  +---o  3:6ca01f7342b9 merge while removing d1/a and moving d1/b to d2/b
+  | |/
+  | o  2:154e6000f54e add d1/a and d1/b
+  | |
+  o |  1:11b5b303e36c uninteresting change
+  |/
+  o  0:7b54db1ebf33 initial
+  
+  $ hg merge 3 --debug
+  note: merging c0ef19750a22+ and 6ca01f7342b9 using bids from ancestors 11b5b303e36c and 154e6000f54e
+  
+  calculating bids for ancestor 11b5b303e36c
+    searching for copies back to rev 3
+    unmatched files in local:
+     d1/a
+     d1/b
+    unmatched files in other:
+     d2/b
+    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
+     src: 'd1/b' -> dst: 'd2/b' 
+    checking for directory renames
+     discovered dir src: 'd1/' -> dst: 'd2/'
+     pending file src: 'd1/a' -> dst: 'd2/a'
+     pending file src: 'd1/b' -> dst: 'd2/b'
+  resolving manifests
+   branchmerge: True, force: False, partial: False
+   ancestor: 11b5b303e36c, local: c0ef19750a22+, remote: 6ca01f7342b9
+   d2/a: remote directory rename - move from d1/a -> dm
+   d2/b: remote directory rename, both created -> m
+  
+  calculating bids for ancestor 154e6000f54e
+    searching for copies back to rev 3
+    unmatched files in other:
+     d2/b
+    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
+     src: 'd1/b' -> dst: 'd2/b' 
+    checking for directory renames
+     discovered dir src: 'd1/' -> dst: 'd2/'
+  resolving manifests
+   branchmerge: True, force: False, partial: False
+   ancestor: 154e6000f54e, local: c0ef19750a22+, remote: 6ca01f7342b9
+   d1/a: other deleted -> r
+   d1/b: other deleted -> r
+   d2/b: remote created -> g
+  
+  auction for merging merge bids
+   d1/a: consensus for r
+   d1/b: consensus for r
+   d2/a: consensus for dm
+   d2/b: picking 'get' action
+  end of auction
+  
+   d1/a: other deleted -> r
+  removing d1/a
+   d1/b: other deleted -> r
+  removing d1/b
+   d2/b: remote created -> g
+  getting d2/b
+  1 files updated, 0 files merged, 2 files removed, 0 files unresolved
+  (branch merge, don't forget to commit)