support multiple sites on the search tag

Author: jasonvarga

src/Search/Tags.php

@@ -54,12 +54,16 @@ protected function queryStatus($query)
 
     protected function querySite($query)
     {
-        $site = $this->params->get(['site', 'locale'], Site::current()->handle());
+        $sites = $this->params->explode(['site', 'locale'], [Site::current()->handle()]);
 
-        if ($site === '*' || ! Site::hasMultiple()) {
+        if (in_array('*', $sites) || ! Site::hasMultiple()) {
             return;
         }
 
-        return $query->where('site', $site);
+        if (count($sites) === 1) {
+            $query->where('site', $sites[0]);
+        } else {
+            $query->whereIn('site', $sites);
+        }
     }
 }