Tokio Kikuchi's fix for SF bug #1629369; folding whitespace allowed in the
display name of an email address, e.g.

Foo
\tBar <foo@example.com>

Test case added by Barry.
diff --git a/Lib/email/_parseaddr.py b/Lib/email/_parseaddr.py
index a08c43e..791d892 100644
--- a/Lib/email/_parseaddr.py
+++ b/Lib/email/_parseaddr.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2002-2006 Python Software Foundation
+# Copyright (C) 2002-2007 Python Software Foundation
 # Contact: email-sig@python.org
 
 """Email address parsing code.
@@ -172,6 +172,7 @@
         self.pos = 0
         self.LWS = ' \t'
         self.CR = '\r\n'
+        self.FWS = self.LWS + self.CR
         self.atomends = self.specials + self.LWS + self.CR
         # Note that RFC 2822 now specifies `.' as obs-phrase, meaning that it
         # is obsolete syntax.  RFC 2822 requires that we recognize obsolete
@@ -418,7 +419,7 @@
         plist = []
 
         while self.pos < len(self.field):
-            if self.field[self.pos] in self.LWS:
+            if self.field[self.pos] in self.FWS:
                 self.pos += 1
             elif self.field[self.pos] == '"':
                 plist.append(self.getquote())