Fix handling of deprecated boolean value of reply_mode option (#1489052)

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Fix handling of deprecated boolean value of reply_mode option (#1489052)
 - Fix parsing invalid date string (#1489035)
 - Add "with attachment" option to messages list filter (#1485382)
 - Call resize handler in intervals to prevent lags and double onresize calls in Chrome (#1489005)

program/steps/mail/compose.inc

@@ -571,7 +571,7 @@ function rcmail_prepare_message_body()
     rcmail_write_forward_attachments();
   }
   // reply/edit/draft/forward
-  else if ($compose_mode && ($compose_mode != RCUBE_COMPOSE_REPLY || $RCMAIL->config->get('reply_mode') != -1)) {
+  else if ($compose_mode && ($compose_mode != RCUBE_COMPOSE_REPLY || intval($RCMAIL->config->get('reply_mode')) != -1)) {
     $isHtml = rcmail_compose_editor_mode();
 
     if (!empty($MESSAGE->parts)) {