Don't clear References and in-Reply-To when a message is "edited as new" (#1489216)

Conflicts:

	CHANGELOG

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Don't clear References and in-Reply-To when a message is "edited as new" (#1489216)
 - Fix messages list sorting with THREAD=REFS
 - Remove deprecated (in PHP 5.5) PREG /e modifier usage (#1489174)
 - Fix empty messages list when register_globals is enabled (#1489157)

program/steps/mail/compose.inc

@@ -210,8 +210,8 @@ if (!empty($msg_uid) && empty($COMPOSE['as_attachment']))
       $COMPOSE['param']['sent_mbox'] = $sent_folder;
     }
   }
-  else if ($compose_mode == RCUBE_COMPOSE_DRAFT) {
+  else if ($compose_mode == RCUBE_COMPOSE_DRAFT || $compose_mode == RCUBE_COMPOSE_EDIT) {
-    if ($draft_info = $MESSAGE->headers->get('x-draft-info')) {
+    if ($compose_mode == RCUBE_COMPOSE_DRAFT && ($draft_info = $MESSAGE->headers->get('x-draft-info'))) {
       // get reply_uid/forward_uid to flag the original message when sending
       $info = rcmail_draftinfo_decode($draft_info);