Fixed issue #1045 - Subject with "Subject: =?us-ascii?Q?ABC / 123 / Wetterau West / ABC?=" is not decoded.

app/models/channel/email_parser.rb

@@ -144,6 +144,11 @@ class Channel::EmailParser
     data[:from_display_name].gsub!(/^'/, '')
     data[:from_display_name].gsub!(/'$/, '')
 
+    # do extra encoding (see issue#1045)
+    if data[:subject].present?
+      data[:subject].sub!(/^=\?us-ascii\?Q\?(.+)\?=$/, '\1')
+    end
+
     # compat headers
     data[:message_id] = data['message-id'.to_sym]
 

test/fixtures/mail50.box

@@ -0,0 +1,22 @@
+From martin@example.com  Thu May  3 12:04:29 2012
+Return-Path: <martin@example.com>
+X-Original-To: info@example.com
+Delivered-To: box@samba.example.com
+Received: from me.home (1-2-1-1.adsl.highway.example.com [1.2.1.1])
+  by samba.example.com (Postfix) with ESMTPSA id C96F8500D3D
+  for <info@example.com>; Thu,  3 May 2012 12:04:28 +0100 (BST)
+Subject: =?us-ascii?Q?ABC / 123 / Wetterau West / ABC?=
+From: <John.Smith@example.com>
+Content-Type: text/plain;
+  charset=iso-8859-1
+Content-Transfer-Encoding: quoted-printable
+Date: Fri, 4 May 2012 14:01:03 +0200
+Message-Id: <BC182994-03FA-4DC5-8202-98CBFACA0887@example.com>
+To: metest@znuny.com
+
+=E4=F6=FC=DF ad asd
+
+-Martin
+
+--
+Old programmers never die. They just branch to a new address.

test/unit/email_parser_test.rb

@@ -1039,6 +1039,14 @@ end
 </div><br><div><img src=\"cid:485376C9-2486-4351-B932-E2010998F579@home\" style=\"width:640px;height:425px;\"></div></div>",
         },
       },
+      {
+        data: IO.binread('test/fixtures/mail50.box'),
+        body_md5: '154c7d3ae7b94f99589df62882841b08',
+        attachments: [],
+        params: {
+          subject: 'ABC / 123 / Wetterau West / ABC',
+        },
+      },
       {
         data: IO.binread('test/fixtures/mail51.box'),
         body_md5: '64675a479f80a674eb7c08e385c3622a',