tests: correct the output order about starting a background thread for Windows

tests: correct the output order about starting a background thread for Windows

I didn't track down where this change occurred.  I assume it's related to some
buffering changes, and/or an explicit flush somewhere.

Differential Revision: https://phab.mercurial-scm.org/D9539

--- a/tests/test-copy-move-merge.t	Mon Dec 07 20:57:50 2020 -0500
+++ b/tests/test-copy-move-merge.t	Mon Dec 07 20:32:05 2020 -0500
@@ -100,10 +100,10 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: b8bf91eeebbc, local: add3f11052fa+, remote: 17c05bb7fcb6
+  starting 4 threads for background file closing (?)
    preserving a for resolve of b
    preserving a for resolve of c
   removing a
-  starting 4 threads for background file closing (?)
    b: remote moved from a -> m (premerge)
   picked tool ':merge' for b (binary False symlink False changedelete False)
   merging a and b to b

--- a/tests/test-double-merge.t	Mon Dec 07 20:57:50 2020 -0500
+++ b/tests/test-double-merge.t	Mon Dec 07 20:32:05 2020 -0500
@@ -35,9 +35,9 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: e6dc8efe11cc, local: 6a0df1dad128+, remote: 484bf6903104
+  starting 4 threads for background file closing (?)
    preserving foo for resolve of bar
    preserving foo for resolve of foo
-  starting 4 threads for background file closing (?)
    bar: remote copied from foo -> m (premerge)
   picked tool ':merge' for bar (binary False symlink False changedelete False)
   merging foo and bar to bar

--- a/tests/test-graft.t	Mon Dec 07 20:57:50 2020 -0500
+++ b/tests/test-graft.t	Mon Dec 07 20:32:05 2020 -0500
@@ -210,8 +210,8 @@
   resolving manifests
    branchmerge: True, force: True, partial: False
    ancestor: 68795b066622, local: ef0ef43d49e7+, remote: 5d205f8b35b6
+  starting 4 threads for background file closing (?)
    preserving b for resolve of b
-  starting 4 threads for background file closing (?)
    b: local copied/moved from a -> m (premerge)
   picked tool ':merge' for b (binary False symlink False changedelete False)
   merging b and a to b

--- a/tests/test-issue672.t	Mon Dec 07 20:57:50 2020 -0500
+++ b/tests/test-issue672.t	Mon Dec 07 20:32:05 2020 -0500
@@ -63,8 +63,8 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: c64f439569a9, local: f4a9cff3cd0b+, remote: 746e9549ea96
+  starting 4 threads for background file closing (?)
    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
@@ -86,9 +86,9 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: c64f439569a9, local: 746e9549ea96+, remote: f4a9cff3cd0b
+  starting 4 threads for background file closing (?)
    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

--- a/tests/test-merge-commit.t	Mon Dec 07 20:57:50 2020 -0500
+++ b/tests/test-merge-commit.t	Mon Dec 07 20:32:05 2020 -0500
@@ -70,8 +70,8 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 0f2ff26688b9, local: 2263c1be0967+, remote: 0555950ead28
+  starting 4 threads for background file closing (?)
    preserving bar for resolve of bar
-  starting 4 threads for background file closing (?)
    bar: versions differ -> m (premerge)
   picked tool ':merge' for bar (binary False symlink False changedelete False)
   merging bar
@@ -157,8 +157,8 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 0f2ff26688b9, local: 2263c1be0967+, remote: 3ffa6b9e35f0
+  starting 4 threads for background file closing (?)
    preserving bar for resolve of bar
-  starting 4 threads for background file closing (?)
    bar: versions differ -> m (premerge)
   picked tool ':merge' for bar (binary False symlink False changedelete False)
   merging bar

--- a/tests/test-merge7.t	Mon Dec 07 20:57:50 2020 -0500
+++ b/tests/test-merge7.t	Mon Dec 07 20:32:05 2020 -0500
@@ -84,8 +84,8 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 96b70246a118, local: 50c3a7e29886+, remote: 40d11a4173a8
+  starting 4 threads for background file closing (?)
    preserving test.txt for resolve of test.txt
-  starting 4 threads for background file closing (?)
    test.txt: versions differ -> m (premerge)
   picked tool ':merge' for test.txt (binary False symlink False changedelete False)
   merging test.txt

--- a/tests/test-rename-merge1.t	Mon Dec 07 20:57:50 2020 -0500
+++ b/tests/test-rename-merge1.t	Mon Dec 07 20:32:05 2020 -0500
@@ -216,8 +216,8 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 5151c134577e, local: 07fcbc9a74ed+, remote: f21419739508
+  starting 4 threads for background file closing (?)
    preserving z for resolve of z
-  starting 4 threads for background file closing (?)
    z: both renamed from y -> m (premerge)
   picked tool ':merge3' for z (binary False symlink False changedelete False)
   merging z

--- a/tests/test-rename-merge2.t	Mon Dec 07 20:57:50 2020 -0500
+++ b/tests/test-rename-merge2.t	Mon Dec 07 20:32:05 2020 -0500
@@ -85,11 +85,10 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 924404dff337, local: e300d1c794ec+, remote: 4ce40f5aca24
+  starting 4 threads for background file closing (?)
    preserving a for resolve of b
    preserving rev for resolve of rev
-  starting 4 threads for background file closing (?)
    b: remote copied from a -> m (premerge)
-  starting 4 threads for background file closing (?)
   picked tool '* ../merge' for b (binary False symlink False changedelete False) (glob)
   merging a and b to b
   my b@e300d1c794ec+ other b@4ce40f5aca24 ancestor a@924404dff337
@@ -165,10 +164,10 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 924404dff337, local: e300d1c794ec+, remote: bdb19105162a
+  starting 4 threads for background file closing (?)
    preserving a for resolve of b
    preserving rev for resolve of rev
   removing a
-  starting 4 threads for background file closing (?)
    b: remote moved from a -> m (premerge)
   picked tool '* ../merge' for b (binary False symlink False changedelete False) (glob)
   merging a and b to b
@@ -204,9 +203,9 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 924404dff337, local: 02963e448370+, remote: f4db7e329e71
+  starting 4 threads for background file closing (?)
    preserving b for resolve of b
    preserving rev for resolve of rev
-  starting 4 threads for background file closing (?)
    b: local copied/moved from a -> m (premerge)
   picked tool '* ../merge' for b (binary False symlink False changedelete False) (glob)
   merging b and a to b
@@ -275,8 +274,8 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 924404dff337, local: 86a2aa42fc76+, remote: 97c705ade336
+  starting 4 threads for background file closing (?)
    preserving rev for resolve of rev
-  starting 4 threads for background file closing (?)
    rev: versions differ -> m (premerge)
   picked tool '* ../merge' for rev (binary False symlink False changedelete False) (glob)
   merging rev
@@ -341,8 +340,8 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 924404dff337, local: 02963e448370+, remote: 97c705ade336
+  starting 4 threads for background file closing (?)
    preserving rev for resolve of rev
-  starting 4 threads for background file closing (?)
    rev: versions differ -> m (premerge)
   picked tool '* ../merge' for rev (binary False symlink False changedelete False) (glob)
   merging rev
@@ -372,9 +371,9 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 924404dff337, local: 62e7bf090eba+, remote: 49b6d8032493
+  starting 4 threads for background file closing (?)
    preserving b for resolve of b
    preserving rev for resolve of rev
-  starting 4 threads for background file closing (?)
    b: both renamed from a -> m (premerge)
   picked tool '* ../merge' for b (binary False symlink False changedelete False) (glob)
   merging b
@@ -454,9 +453,9 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 924404dff337, local: 86a2aa42fc76+, remote: af30c7647fc7
+  starting 4 threads for background file closing (?)
    preserving b for resolve of b
    preserving rev for resolve of rev
-  starting 4 threads for background file closing (?)
    b: both created -> m (premerge)
   picked tool '* ../merge' for b (binary False symlink False changedelete False) (glob)
   merging b
@@ -496,9 +495,9 @@
    ancestor: 924404dff337, local: 59318016310c+, remote: bdb19105162a
    a: other deleted -> r
   removing a
+  starting 4 threads for background file closing (?)
    preserving b for resolve of b
    preserving rev for resolve of rev
-  starting 4 threads for background file closing (?)
    b: both created -> m (premerge)
   picked tool '* ../merge' for b (binary False symlink False changedelete False) (glob)
   merging b
@@ -574,9 +573,9 @@
    ancestor: 924404dff337, local: 59318016310c+, remote: bdb19105162a
    a: other deleted -> r
   removing a
+  starting 4 threads for background file closing (?)
    preserving b for resolve of b
    preserving rev for resolve of rev
-  starting 4 threads for background file closing (?)
    b: both created -> m (premerge)
   picked tool '* ../merge' for b (binary False symlink False changedelete False) (glob)
   merging b
@@ -650,11 +649,10 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 924404dff337, local: 0b76e65c8289+, remote: 4ce40f5aca24
+  starting 4 threads for background file closing (?)
    preserving b for resolve of b
    preserving rev for resolve of rev
-  starting 4 threads for background file closing (?)
    b: both renamed from a -> m (premerge)
-  starting 4 threads for background file closing (?)
   picked tool '* ../merge' for b (binary False symlink False changedelete False) (glob)
   merging b
   my b@0b76e65c8289+ other b@4ce40f5aca24 ancestor a@924404dff337
@@ -687,9 +685,9 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 924404dff337, local: 02963e448370+, remote: 8dbce441892a
+  starting 4 threads for background file closing (?)
    preserving b for resolve of b
    preserving rev for resolve of rev
-  starting 4 threads for background file closing (?)
    b: both renamed from a -> m (premerge)
   picked tool '* ../merge' for b (binary False symlink False changedelete False) (glob)
   merging b
@@ -722,9 +720,9 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 924404dff337, local: 0b76e65c8289+, remote: bdb19105162a
+  starting 4 threads for background file closing (?)
    preserving b for resolve of b
    preserving rev for resolve of rev
-  starting 4 threads for background file closing (?)
    b: both renamed from a -> m (premerge)
   picked tool '* ../merge' for b (binary False symlink False changedelete False) (glob)
   merging b
@@ -760,10 +758,10 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 924404dff337, local: e300d1c794ec+, remote: 49b6d8032493
+  starting 4 threads for background file closing (?)
    preserving a for resolve of b
    preserving rev for resolve of rev
   removing a
-  starting 4 threads for background file closing (?)
    b: remote moved from a -> m (premerge)
   picked tool '* ../merge' for b (binary False symlink False changedelete False) (glob)
   merging a and b to b
@@ -803,9 +801,9 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 924404dff337, local: 62e7bf090eba+, remote: f4db7e329e71
+  starting 4 threads for background file closing (?)
    preserving b for resolve of b
    preserving rev for resolve of rev
-  starting 4 threads for background file closing (?)
    b: local copied/moved from a -> m (premerge)
   picked tool '* ../merge' for b (binary False symlink False changedelete False) (glob)
   merging b and a to b

--- a/tests/test-subrepo.t	Mon Dec 07 20:57:50 2020 -0500
+++ b/tests/test-subrepo.t	Mon Dec 07 20:32:05 2020 -0500
@@ -315,8 +315,8 @@
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 6747d179aa9a, local: 20a0db6fbf6c+, remote: 7af322bc1198
+  starting 4 threads for background file closing (?)
    preserving t for resolve of t
-  starting 4 threads for background file closing (?)
    t: versions differ -> m (premerge)
   picked tool ':merge' for t (binary False symlink False changedelete False)
   merging t

--- a/tests/test-up-local-change.t	Mon Dec 07 20:57:50 2020 -0500
+++ b/tests/test-up-local-change.t	Mon Dec 07 20:32:05 2020 -0500
@@ -70,8 +70,8 @@
    ancestor: 1e71731e6fbb, local: 1e71731e6fbb+, remote: c19d34741b0a
    b: other deleted -> r
   removing b
+  starting 4 threads for background file closing (?)
    preserving a for resolve of a
-  starting 4 threads for background file closing (?)
    a: versions differ -> m (premerge)
   picked tool 'true' for a (binary False symlink False changedelete False)
   merging a