Correct vendor string for GMail is 'gimap'

config/defaults.inc.php

@@ -181,7 +181,7 @@ $config['imap_delimiter'] = null;
 
 // If you know your imap's folder vendor, you can specify it here.
 // Otherwise it will be determined automatically. Use lower-case
-// identifiers, e.g. 'dovecot', 'cyrus', 'gmail', 'hmail', 'uw-imap'.
+// identifiers, e.g. 'dovecot', 'cyrus', 'gimap', 'hmail', 'uw-imap'.
 $config['imap_vendor'] = null;
 
 // If IMAP server doesn't support NAMESPACE extension, but you're

program/lib/Roundcube/rcube_imap.php

@@ -644,7 +644,7 @@ class rcube_imap extends rcube_storage
 
         $vendor  = (string) (!empty($ident) ? $ident['name'] : '');
         $ident   = strtolower($vendor . ' ' . $this->conn->data['GREETING']);
-        $vendors = array('cyrus', 'dovecot', 'uw-imap', 'gmail', 'hmail');
+        $vendors = array('cyrus', 'dovecot', 'uw-imap', 'gimap', 'hmail');
 
         foreach ($vendors as $v) {
             if (strpos($ident, $v) !== false) {