Issue #3270947 by zarexogre, flocondetoile: Favicon for microsites doesnt work for D9

micro_site.module

@@ -295,18 +295,18 @@ function micro_site_page_attachments_alter(array &$attachments) {
       $favicon_changed = FALSE;
       $type = $file->getMimeType();
       $favicon_uri = $file->getFileUri();
-      $favicon_url = file_url_transform_relative(file_create_url($favicon_uri));
+      $favicon_url = \Drupal::service('file_url_generator')->generateString($favicon_uri);
       $html_head_link = $attachments['#attached']['html_head_link'];
       foreach ($html_head_link as $key => $value) {
-        if (isset($value[0]['rel'])){
+        if (isset($value[0]['rel'])) {
           switch ($value[0]['rel']) {
-            case 'shortcut icon':
+            case 'icon':
               $attachments['#attached']['html_head_link'][$key] = [
                 [
-                  'rel' => 'shortcut icon',
+                  'rel' => 'icon',
                   'href' => UrlHelper::stripDangerousProtocols($favicon_url),
                   'type' => $type,
-                ]
+                ],
               ];
               $favicon_changed = TRUE;
               break;
@@ -316,7 +316,7 @@ function micro_site_page_attachments_alter(array &$attachments) {
 
       if (!$favicon_changed) {
         $attachments['#attached']['html_head_link'][][] = [
-          'rel' => 'shortcut icon',
+          'rel' => 'icon',
           'href' => UrlHelper::stripDangerousProtocols($favicon_url),
           'type' => $type,
         ];