Add imap_cache_ttl option to configure TTL of imap_cache

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Add imap_cache_ttl option to configure TTL of imap_cache
 - Make LDAP cache engine configurable via ldap_cache and ldap_cache_ttl options
 - Fix legacy options handling
 - Fix "duplicate entry" errors on inserts to imap cache tables (#1489146)

config/main.inc.php.dist

@@ -128,6 +128,9 @@ $rcmail_config['imap_cache'] = null;
 // Enables messages cache. Only 'db' cache is supported.
 $rcmail_config['messages_cache'] = false;
 
+// Lifetime of IMAP indexes cache. Possible units: s, m, h, d, w
+$rcmail_config['imap_cache_ttl'] = '10d';
+
 // Lifetime of messages cache. Possible units: s, m, h, d, w
 $rcmail_config['messages_cache_ttl'] = '10d';
 

program/lib/Roundcube/rcube_imap.php

@@ -3691,7 +3691,7 @@ class rcube_imap extends rcube_storage
     {
         if ($this->caching && !$this->cache) {
             $rcube = rcube::get_instance();
-            $ttl = $rcube->config->get('messages_cache_ttl', '10d');
+            $ttl = $rcube->config->get('imap_cache_ttl', '10d');
             $this->cache = $rcube->get_cache('IMAP', $this->caching, $ttl);
         }