[PATCH 4/6] send-email: fix threaded mails without chain-reply-to

[Junio C Hamano <junio@pobox.com>]

From: Markus Heidelberg <markus.heidelberg@web.de>
Date: Sun, 7 Jun 2009 23:40:54 +0200

An earlier commit 15da108 ("send-email: 'References:' should only
reference what is sent", 2009-04-13) broke logic to set up threading
information for the next message by rewriting "!" to "not" without
understanding the precedence rules of the language.

Namely,

    ! defined $reply_to || length($reply_to) == 0

was changed to

    not defined $reply_to || length($reply_to) == 0

which is

    not (defined $reply_to || length($reply_to) == 0)

and different from what was intended, which is

    (not defined $reply_to) || (length($reply_to) == 0)

Signed-off-by: Markus Heidelberg <markus.heidelberg@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

 * Applies on top of 15da108 to fix the breakage there.

 git-send-email.perl |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/git-send-email.perl b/git-send-email.perl
index 43f956b..c55b045 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -1135,7 +1135,8 @@ foreach my $t (@files) {
 	my $message_was_sent = send_message();
 
 	# set up for the next message
-	if ($message_was_sent and $chain_reply_to || not defined $reply_to || length($reply_to) == 0) {
+	if ($message_was_sent &&
+		($chain_reply_to || !defined $reply_to || length($reply_to) == 0)) {
 		$reply_to = $message_id;
 		if (length $references > 0) {
 			$references .= "\n $message_id";
-- 
1.6.3.2.214.gf4f78e