Fix zipped messages downloads after selecting all messages in a folder (#1490339)

CHANGELOG

@@ -6,6 +6,7 @@ CHANGELOG Roundcube Webmail
 - Plugin API: Added message_part_body hook
 - Plugin API: Add special onload() method to execute plugin actions before startup (session and GUI initialization)
 - Fix handling of %-encoded entities in mailto: URLs (#1490346)
+- Fix zipped messages downloads after selecting all messages in a folder (#1490339)
 
 RELEASE 1.1.1
 -------------

plugins/zipdownload/zipdownload.php

@@ -211,6 +211,11 @@ class zipdownload extends rcube_plugin
             $imap->set_folder($mbox);
             $path = $folders ? str_replace($imap->get_hierarchy_delimiter(), '/', $mbox) . '/' : '';
 
+            if ($uids === '*') {
+                $index = $imap->index($mbox, null, null, true);
+                $uids  = $index->get();
+            }
+
             foreach ($uids as $uid) {
                 $headers = $imap->get_message_headers($uid);