Issue #11: Used default theme favicon instead of administrative theme…

… favicon.

d8.profile

@@ -5,6 +5,7 @@
  * Basis for the site on Drupal 8.
  */
 
+use Drupal\Component\Utility\UrlHelper;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Database\Database;
 use Drupal\Core\Url;
@@ -39,3 +40,24 @@ function _d8_user_login_form_submit(array &$form, FormStateInterface $form_state
     $form_state->setRedirectUrl(Url::fromUserInput($path));
   }
 }
+
+/**
+ * Implements hook_page_attachments_alter().
+ */
+function d8_page_attachments_alter(array &$attachments) {
+  $theme = \Drupal::config('system.theme')->get('default');
+
+  if ($theme != \Drupal::theme()->getActiveTheme()->getName() && theme_get_setting('features.favicon') && !empty($attachments['#attached']['html_head_link']) && is_array($attachments['#attached']['html_head_link'])) {
+    foreach ($attachments['#attached']['html_head_link'] as &$links) {
+      if (!empty($links) && is_array($links)) {
+        foreach ($links as &$link) {
+          if (!empty($link) && is_array($link) && !empty($link['rel']) && $link['rel'] == 'shortcut icon' && !empty($link['type']) && $link['type'] == theme_get_setting('favicon.mimetype') && !empty($link['href'])) {
+            $favicon = theme_get_setting('favicon.url', $theme);
+            $link['href'] = UrlHelper::stripDangerousProtocols($favicon);
+            return;
+          }
+        }
+      }
+    }
+  }
+}