send-email: do not reverse the command line arguments

The loop picks elements from @ARGV one by one, sifts them into arguments
meant for format-patch and the script itself, and pushes them to @files
and @rev_list_opts arrays.  Pick elements from @ARGV starting at the
beginning using shift, instead of at the end using pop, as push appends
them to the end of the array.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-send-email.perl

@@ -421,7 +421,7 @@ ($)
 # Now that all the defaults are set, process the rest of the command line
 # arguments and collect up the files that need to be processed.
 my @rev_list_opts;
-while (my $f = pop @ARGV) {
+while (defined(my $f = shift @ARGV)) {
 	if ($f eq "--") {
 		push @rev_list_opts, "--", @ARGV;
 		@ARGV = ();

t/t9001-send-email.sh

@@ -300,4 +300,17 @@ test_expect_success 'detects ambiguous reference/file conflict' '
 	grep disambiguate errors
 '
 
+test_expect_success 'feed two files' '
+	rm -fr outdir &&
+	git format-patch -2 -o outdir &&
+	GIT_SEND_EMAIL_NOTTY=1 git send-email \
+	--dry-run \
+	--from="Example <nobody@example.com>" \
+	--to=nobody@example.com \
+	outdir/000?-*.patch 2>errors >out &&
+	grep "^Subject: " out >subjects &&
+	test "z$(sed -n -e 1p subjects)" = "zSubject: [PATCH 1/2] Second." &&
+	test "z$(sed -n -e 2p subjects)" = "zSubject: [PATCH 2/2] add master"
+'
+
 test_done