title: Swiftmailer: Missing space in subject email
body: <p>I'm using <code>SwiftMailer (v 4.2.2)</code> to send my emails, and I recently observed that when SwiftMailer construct an email, if it has a long subject, it inserts line breaks into it in the header of the mail.</p>
  
  <p><strong>Subject</strong>:</p>
  
  <pre><code>Lorem ipsum dolor sit amet =?iso-8859-1?Q?consect=E9tur?=
  adipisicing elit
  </code></pre>
  
  <p>The original subject was : <code>Lorem ipsum dolor sit amet consectétur adipisicing elit</code></p>
  
  <p>When I send the mail (using Mandrill, or even the php mailer with my local SMTP server), I receive the mail with the subject <code>Lorem ipsum dolor sit amet consectéturadipisicing elit</code></p>
  
  <p><em>The space is missing, just where the line break was inserted in the header</em>.</p>
  
  <p>I tried the solution on this <a href="https://github.com/swiftmailer/swiftmailer/issues/393" rel="nofollow">thread</a> : removing the <code>\r</code> in the function <code>getTokenAsEncodedWord()</code> in <code>classes/Swift/Mime/Headers/AbstractHeader.php</code> , but it doesn't seem to work.</p>
  
  <p>Does anyone have a solution for this?</p>
  
  <p>Thanks in advance.</p>