The git-send-email always use RFC2047 subject quoting for files
with "broken" encoding - non-ASCII files without Content-Transfer-Encoding,
even for ASCII subjects. Now for ASCII subjects the RFC2047 quoting will be
skipped.

Signed-off-by: Krzysztof Mazur <krzys...@podlesie.net>
---
 git-send-email.perl   |  3 ++-
 t/t9001-send-email.sh | 17 +++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/git-send-email.perl b/git-send-email.perl
index adcb4e3..efeae4c 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -1327,7 +1327,8 @@ foreach my $t (@files) {
                $body_encoding = $auto_8bit_encoding;
        }
 
-       if ($broken_encoding{$t} && !is_rfc2047_quoted($subject)) {
+       if ($broken_encoding{$t} && !is_rfc2047_quoted($subject) &&
+                       ($subject =~ /[^[:ascii:]]/)) {
                $subject = quote_rfc2047($subject, $auto_8bit_encoding);
        }
 
diff --git a/t/t9001-send-email.sh b/t/t9001-send-email.sh
index 89fceda..6c6af7d 100755
--- a/t/t9001-send-email.sh
+++ b/t/t9001-send-email.sh
@@ -1143,6 +1143,23 @@ EOF
 '
 
 test_expect_success $PREREQ 'setup expect' '
+cat >expected <<EOF
+Subject: subject goes here
+EOF
+'
+
+test_expect_success $PREREQ 'ASCII subject is not RFC2047 quoted' '
+       clean_fake_sendmail &&
+       echo bogus |
+       git send-email --from=aut...@example.com --to=nob...@example.com \
+                       --smtp-server="$(pwd)/fake.sendmail" \
+                       --8bit-encoding=UTF-8 \
+                       email-using-8bit >stdout &&
+       grep "Subject" msgtxt1 >actual &&
+       test_cmp expected actual
+'
+
+test_expect_success $PREREQ 'setup expect' '
 cat >content-type-decl <<EOF
 MIME-Version: 1.0
 Content-Type: text/plain; charset=UTF-8
-- 
1.8.0.3.gf4c35fc

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