print: Open print on a new tab/window

include/staff/ticket-view.inc.php

@@ -907,7 +907,8 @@ $tcount = $ticket->getThreadEntries($types)->count();
     <h3><?php echo __('Ticket Print Options');?></h3>
     <a class="close" href=""><i class="icon-remove-circle"></i></a>
     <hr/>
-    <form action="tickets.php?id=<?php echo $ticket->getId(); ?>" method="post" id="print-form" name="print-form">
+    <form action="tickets.php?id=<?php echo $ticket->getId(); ?>"
+        method="post" id="print-form" name="print-form" target="_blank">
         <?php csrf_token(); ?>
         <input type="hidden" name="a" value="print">
         <input type="hidden" name="id" value="<?php echo $ticket->getId(); ?>">