Issue #1992834 by alexpott: Fixed Unnecessarily setting up the array of...

Issue #1992834 by alexpott: Fixed Unnecessarily setting up the array of priority formats for content negotiation within a loop.

core/lib/Drupal/Core/ContentNegotiation.php

@@ -38,9 +38,9 @@ public function getContentType(Request $request) {
 
     // Check all formats, if priority format is found return it.
     $first_found_format = FALSE;
+    $priority = array('html', 'drupal_ajax', 'drupal_modal', 'drupal_dialog');
     foreach ($request->getAcceptableContentTypes() as $mime_type) {
       $format = $request->getFormat($mime_type);
-      $priority = array('html', 'drupal_ajax', 'drupal_modal', 'drupal_dialog');
       if (in_array($format, $priority, TRUE)) {
         return $format;
       }