- Backport r5637 fix for searching without CHARSET

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Fix searching on IMAP servers without CHARSET specifier support (#1488271)
 - Fix crash with eAccelerator (#1488256)
 - Fix expanding folders during drag&drop (#1488260)
 - Fix wrong postgres sequence name in upgrade from 0.6

program/include/rcube_imap.php

@@ -1722,7 +1722,7 @@ class rcube_imap
             // Error, try with US-ASCII (some servers may support only US-ASCII)
             if ($a_messages === false && $charset && $charset != 'US-ASCII')
                 $a_messages = $this->conn->search($mailbox,
-                    'CHARSET US-ASCII ' . $this->convert_criteria($criteria, $charset));
+                    $this->convert_criteria($criteria, $charset));
 
             // I didn't found that SEARCH should return sorted IDs
             if (is_array($a_messages) && !$this->sort_field)