From d701e6565240bdb209b2b74f07905ab34d35432c Mon Sep 17 00:00:00 2001
From: Aleksey Bobkov <aleksey.bobkov@gmail.com>
Date: Wed, 9 Jan 2019 17:24:25 -0800
Subject: [PATCH] Minor improvement in the update gateway API calls.

---
 modules/system/classes/UpdateManager.php | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/modules/system/classes/UpdateManager.php b/modules/system/classes/UpdateManager.php
index 53f90a089..4be195a33 100644
--- a/modules/system/classes/UpdateManager.php
+++ b/modules/system/classes/UpdateManager.php
@@ -227,10 +227,16 @@ class UpdateManager
         $frozen = $installed->lists('is_frozen', 'code');
         $updatable = $installed->lists('is_updatable', 'code');
         $build = Parameter::get('system::core.build');
+        $themes = [];
+
+        if ($this->themeManager) {
+            $themes = array_keys($this->themeManager->getInstalled());
+        }
 
         $params = [
             'core' => $this->getHash(),
             'plugins' => serialize($versions),
+            'themes' => serialize($themes),
             'build' => $build,
             'force' => $force
         ];