Expunge all cache instances in shutdown

program/lib/Roundcube/rcube.php

@@ -897,6 +897,9 @@ class rcube
 
         foreach ($this->caches as $cache) {
             if (is_object($cache)) {
+                if ($this->expunge_cache) {
+                    $cache->expunge();
+                }
                 $cache->close();
             }
         }

program/lib/Roundcube/rcube_cache.php

@@ -192,7 +192,7 @@ class rcube_cache
      */
     function expunge()
     {
-        if ($this->type == 'db' && $this->db) {
+        if ($this->type == 'db' && $this->db && $this->ttl) {
             $this->db->query(
                 "DELETE FROM ".$this->db->table_name('cache').
                 " WHERE user_id = ?".

program/lib/Roundcube/rcube_cache_shared.php

@@ -191,7 +191,7 @@ class rcube_cache
      */
     function expunge()
     {
-        if ($this->type == 'db' && $this->db) {
+        if ($this->type == 'db' && $this->db && $this->ttl) {
             $this->db->query(
                 "DELETE FROM " . $this->table
                 . " WHERE cache_key LIKE ?"

program/lib/Roundcube/rcube_imap.php

@@ -3749,9 +3749,12 @@ class rcube_imap extends rcube_storage
             $this->mcache->expunge($ttl);
         }
 
+/*
+        // this cache is expunged by rcube class
         if ($this->cache) {
             $this->cache->expunge();
         }
+*/
     }