Fix sorting messages by size on servers without SORT capability (#1489981)

CHANGELOG

@@ -22,6 +22,7 @@ CHANGELOG Roundcube Webmail
 - Fix Delete button state after deleting identity/response (#1489972)
 - Fix bug where contacts with no email address were listed on compose addressbook (#1489970)
 - Fix images import from various vCard formats (#1489977)
+- Fix sorting messages by size on servers without SORT capability (#1489981)
 
 RELEASE 1.0.1
 -------------

program/lib/Roundcube/rcube_imap_generic.php

@@ -1854,8 +1854,8 @@ class rcube_imap_generic
                         $result[$id] = '';
                     }
                 } else if ($mode == 2) {
-                    if (preg_match('/(UID|RFC822\.SIZE) ([0-9]+)/', $line, $matches)) {
-                        $result[$id] = trim($matches[2]);
+                    if (preg_match('/' . $index_field . ' ([0-9]+)/', $line, $matches)) {
+                        $result[$id] = trim($matches[1]);
                     } else {
                         $result[$id] = 0;
                     }