format-patch: --numbered-files and --stdout aren't mutually exclusive

For example:

    git format-patch --numbered-files --stdout --attach HEAD~~

will create two messages with files 1 and 2 attached respectively.
There is no effect when using --numbered-files and --stdout together
without an --attach or --inline, the --numbered-files option will be
ignored. Add a test to show this.

Signed-off-by: Stephen Boyd <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: bebarino

t/t4013-diff-various.sh

@@ -251,7 +251,7 @@ format-patch --attach --stdout initial..master^
 format-patch --attach --stdout initial..master
 format-patch --inline --stdout initial..side
 format-patch --inline --stdout initial..master^
-format-patch --inline --stdout initial..master
+format-patch --inline --stdout --numbered-files initial..master
 format-patch --inline --stdout initial..master
 format-patch --inline --stdout --subject-prefix=TESTCASE initial..master
 config format.subjectprefix DIFFERENT_PREFIX

t/t4013/diff.format-patch_--inline_--stdout_--numbered-files_initial..master

@@ -0,0 +1,170 @@
+$ git format-patch --inline --stdout --numbered-files initial..master
+From 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44 Mon Sep 17 00:00:00 2001
+From: A U Thor <[email protected]>
+Date: Mon, 26 Jun 2006 00:01:00 +0000
+Subject: [PATCH 1/3] Second
+MIME-Version: 1.0
+Content-Type: multipart/mixed; boundary="------------g-i-t--v-e-r-s-i-o-n"
+
+This is a multi-part message in MIME format.
+--------------g-i-t--v-e-r-s-i-o-n
+Content-Type: text/plain; charset=UTF-8; format=fixed
+Content-Transfer-Encoding: 8bit
+
+
+This is the second commit.
+---
+ dir/sub |    2 ++
+ file0   |    3 +++
+ file2   |    3 ---
+ 3 files changed, 5 insertions(+), 3 deletions(-)
+ delete mode 100644 file2
+
+
+--------------g-i-t--v-e-r-s-i-o-n
+Content-Type: text/x-patch; name="1"
+Content-Transfer-Encoding: 8bit
+Content-Disposition: inline; filename="1"
+
+diff --git a/dir/sub b/dir/sub
+index 35d242b..8422d40 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -1,2 +1,4 @@
+ A
+ B
++C
++D
+diff --git a/file0 b/file0
+index 01e79c3..b414108 100644
+--- a/file0
++++ b/file0
+@@ -1,3 +1,6 @@
+ 1
+ 2
+ 3
++4
++5
++6
+diff --git a/file2 b/file2
+deleted file mode 100644
+index 01e79c3..0000000
+--- a/file2
++++ /dev/null
+@@ -1,3 +0,0 @@
+-1
+-2
+-3
+
+--------------g-i-t--v-e-r-s-i-o-n--
+
+
+
+From 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0 Mon Sep 17 00:00:00 2001
+From: A U Thor <[email protected]>
+Date: Mon, 26 Jun 2006 00:02:00 +0000
+Subject: [PATCH 2/3] Third
+MIME-Version: 1.0
+Content-Type: multipart/mixed; boundary="------------g-i-t--v-e-r-s-i-o-n"
+
+This is a multi-part message in MIME format.
+--------------g-i-t--v-e-r-s-i-o-n
+Content-Type: text/plain; charset=UTF-8; format=fixed
+Content-Transfer-Encoding: 8bit
+
+---
+ dir/sub |    2 ++
+ file1   |    3 +++
+ 2 files changed, 5 insertions(+), 0 deletions(-)
+ create mode 100644 file1
+
+
+--------------g-i-t--v-e-r-s-i-o-n
+Content-Type: text/x-patch; name="2"
+Content-Transfer-Encoding: 8bit
+Content-Disposition: inline; filename="2"
+
+diff --git a/dir/sub b/dir/sub
+index 8422d40..cead32e 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -2,3 +2,5 @@ A
+ B
+ C
+ D
++E
++F
+diff --git a/file1 b/file1
+new file mode 100644
+index 0000000..b1e6722
+--- /dev/null
++++ b/file1
+@@ -0,0 +1,3 @@
++A
++B
++C
+
+--------------g-i-t--v-e-r-s-i-o-n--
+
+
+
+From c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a Mon Sep 17 00:00:00 2001
+From: A U Thor <[email protected]>
+Date: Mon, 26 Jun 2006 00:03:00 +0000
+Subject: [PATCH 3/3] Side
+MIME-Version: 1.0
+Content-Type: multipart/mixed; boundary="------------g-i-t--v-e-r-s-i-o-n"
+
+This is a multi-part message in MIME format.
+--------------g-i-t--v-e-r-s-i-o-n
+Content-Type: text/plain; charset=UTF-8; format=fixed
+Content-Transfer-Encoding: 8bit
+
+---
+ dir/sub |    2 ++
+ file0   |    3 +++
+ file3   |    4 ++++
+ 3 files changed, 9 insertions(+), 0 deletions(-)
+ create mode 100644 file3
+
+
+--------------g-i-t--v-e-r-s-i-o-n
+Content-Type: text/x-patch; name="3"
+Content-Transfer-Encoding: 8bit
+Content-Disposition: inline; filename="3"
+
+diff --git a/dir/sub b/dir/sub
+index 35d242b..7289e35 100644
+--- a/dir/sub
++++ b/dir/sub
+@@ -1,2 +1,4 @@
+ A
+ B
++1
++2
+diff --git a/file0 b/file0
+index 01e79c3..f4615da 100644
+--- a/file0
++++ b/file0
+@@ -1,3 +1,6 @@
+ 1
+ 2
+ 3
++A
++B
++C
+diff --git a/file3 b/file3
+new file mode 100644
+index 0000000..7289e35
+--- /dev/null
++++ b/file3
+@@ -0,0 +1,4 @@
++A
++B
++1
++2
+
+--------------g-i-t--v-e-r-s-i-o-n--
+
+
+$