Merge branch 'mh/maint-fix-send-email-threaded' into mh/fix-send-email-threaded

* mh/maint-fix-send-email-threaded:
  doc/send-email: clarify the behavior of --in-reply-to with --no-thread
  send-email: fix non-threaded mails
  add a test for git-send-email for non-threaded mails

Conflicts:
	git-send-email.perl
	t/t9001-send-email.sh

Documentation/git-send-email.txt

@@ -165,7 +165,7 @@ Automating
 	Output of this command must be single email address per line.
 	Default is the value of 'sendemail.cccmd' configuration value.
 
---[no-]chain-reply-to=<identifier>::
+--[no-]chain-reply-to::
 	If this is set, each email will be sent as a reply to the previous
 	email sent.  If disabled with "--no-chain-reply-to", all emails after
 	the first will be sent as replies to the first email sent.  When using
@@ -214,7 +214,8 @@ specified, as well as 'body' if --no-signed-off-cc is specified.
 --[no-]thread::
 	If this is set, the In-Reply-To header will be set on each email sent.
 	If disabled with "--no-thread", no emails will have the In-Reply-To
-	header set. Default is the value of the 'sendemail.thread' configuration
+	header set, unless specified with --in-reply-to.
+	Default is the value of the 'sendemail.thread' configuration
 	value; if that is unspecified, default to --thread.
 
 

git-send-email.perl

@@ -1150,7 +1150,7 @@ sub send_message
 	my $message_was_sent = send_message();
 
 	# set up for the next message
-	if ($message_was_sent &&
+	if ($thread && $message_was_sent &&
 		($chain_reply_to || !defined $reply_to || length($reply_to) == 0)) {
 		$reply_to = $message_id;
 		if (length $references > 0) {

t/t9001-send-email.sh

@@ -621,6 +621,16 @@ test_expect_success 'in-reply-to but no threading' '
 	grep "In-Reply-To: <in-reply-id@example.com>"
 '
 
+test_expect_success 'no in-reply-to and no threading' '
+	git send-email \
+		--dry-run \
+		--from="Example <nobody@example.com>" \
+		--to=nobody@example.com \
+		--nothread \
+		$patches $patches >stdout &&
+	! grep "In-Reply-To: " stdout
+'
+
 test_expect_success 'threading but no chain-reply-to' '
 	git send-email \
 		--dry-run \