Fix PHP error in Preferences when default_folders was in dont_override (#1489940)

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Fix PHP error in Preferences when default_folders was in dont_override (#1489940)
 - Add configurable LDAP_OPT_DEREF option (#1489864)
 - Fix unintentional draft autosave request if autosave is disabled (#1489882)
 - Fix malformed References: header in send/saved mail (#1489891)

program/steps/settings/func.inc

@@ -1035,7 +1035,8 @@ function rcmail_user_prefs($current = null)
             }
 
             // Configure special folders
-            if (!isset($no_override['default_folders']) && $current) {
+            $set = array('drafts_mbox', 'sent_mbox', 'junk_mbox', 'trash_mbox');
+            if ($current && count(array_intersect($no_override, $set)) < 4) {
                 $select = $RCMAIL->folder_selector(array(
                     'noselection'   => '---',
                     'realnames'     => true,

program/steps/settings/save_prefs.inc

@@ -192,17 +192,10 @@ case 'addressbook':
 
 case 'folders':
     // special handling for 'default_folders'
-    if (in_array('default_folders', (array)$CONFIG['dont_override'])) {
-        foreach (array('drafts_mbox','sent_mbox','junk_mbox','trash_mbox') as $p) {
-            $a_user_prefs[$p] = $CONFIG[$p];
-        }
-    }
-    else {
-        $a_user_prefs['default_folders'] = array('INBOX');
-        foreach (array('drafts_mbox','sent_mbox','junk_mbox','trash_mbox') as $p) {
-            if ($a_user_prefs[$p]) {
-                $a_user_prefs['default_folders'][] = $a_user_prefs[$p];
-            }
+    $a_user_prefs['default_folders'] = array('INBOX');
+    foreach (array('drafts_mbox', 'sent_mbox', 'junk_mbox', 'trash_mbox') as $p) {
+        if ($a_user_prefs[$p]) {
+            $a_user_prefs['default_folders'][] = $a_user_prefs[$p];
         }
     }