Nil charset caused subject line to be improperly quoted in implicitly multipart messages (closes #2662)

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3960 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionmailer/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Nil charset caused subject line to be improperly quoted in implicitly multipart messages #2662 [ehalvorsen+rails@runbox.com]
+
 * Parse content-type apart before using it so that sub-parts of the header can be set correctly #2918 [Jamis Buck]
 
 * Make custom headers work in subparts #4034 [elan@bluemandrill.com]

actionmailer/lib/action_mailer/base.rb

@@ -293,7 +293,6 @@ module ActionMailer
           end
           unless @parts.empty?
             @content_type = "multipart/alternative"
-            @charset = nil
             @parts = sort_parts(@parts, @implicit_parts_order)
           end
         end
@@ -432,7 +431,10 @@ module ActionMailer
             m.parts << part
           end
           
-          m.set_content_type(real_content_type, nil, ctype_attrs) if real_content_type =~ /multipart/
+          if real_content_type =~ /multipart/
+            ctype_attrs.delete "charset"
+            m.set_content_type(real_content_type, nil, ctype_attrs)
+          end
         end
 
         @mail = m

actionmailer/test/mail_service_test.rb

@@ -167,6 +167,14 @@ class TestMailer < ActionMailer::Base
     @implicit_parts_order = order if order
   end
 
+  def implicitly_multipart_with_utf8
+    recipients "no.one@nowhere.test"
+    subject    "Foo áëô îü"
+    from       "some.one@somewhere.test"
+    template   "implicitly_multipart_example"
+    body       ({ "recipient" => "no.one@nowhere.test" })
+  end
+
   def html_mail(recipient)
     recipients   recipient
     subject      "html mail"
@@ -646,6 +654,11 @@ EOF
     assert_match(/\nSubject: =\?utf-8\?Q\?Foo_.*?\?=/, mail.encoded)
   end
 
+  def test_implicitly_multipart_with_utf8
+    mail = TestMailer.create_implicitly_multipart_with_utf8
+    assert_match(/\nSubject: =\?utf-8\?Q\?Foo_.*?\?=/, mail.encoded)
+  end
+
   def test_explicitly_multipart_messages
     mail = TestMailer.create_explicitly_multipart_example(@recipient)
     assert_equal 3, mail.parts.length