Implemented new_messages plugin hook (#1486005)

CHANGELOG

@@ -1,6 +1,8 @@
 CHANGELOG RoundCube Webmail
 ===========================
 
+- Added 'new_messages' plugin hook (#1486005)
+- Added 'logout_after' plugin hook (#1486042)
 - Added 'message_compose' hook
 - Added 'imap_connect' hook (#1485956)
 - Fix vcard_attachments plugin (#1486035)

program/steps/mail/check_recent.inc

@@ -47,6 +47,9 @@ foreach ($a_mailboxes as $mbox_name) {
       if (!empty($_GET['_quota']))
         $OUTPUT->command('set_quota', rcmail_quota_content($IMAP->get_quota()));
 
+      // trigger plugin hook
+      $RCMAIL->plugins->exec_hook('new_messages', array('mailbox' => $mbox_name, 'count' => $unread_count));
+
       // "No-list" mode, don't get messages
       if (empty($_GET['_list']))
         continue;