link formatter diff

linkformatter.patch

diff --git a/core/modules/link/src/Plugin/Field/FieldFormatter/LinkFormatter.php b/core/modules/link/src/Plugin/Field/FieldFormatter/LinkFormatter.php
index f1d179f..4b51e9d 100644
--- a/core/modules/link/src/Plugin/Field/FieldFormatter/LinkFormatter.php
+++ b/core/modules/link/src/Plugin/Field/FieldFormatter/LinkFormatter.php
@@ -13,6 +13,7 @@
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Url;
 use Drupal\link\LinkItemInterface;
+use Symfony\Component\HttpFoundation\Request;

 /**
  * Plugin implementation of the 'link' formatter.
@@ -206,7 +207,16 @@ protected function buildUrl(LinkItemInterface $item) {
     }

     if ($item->isExternal()) {
-      $url = Url::unrouted($item->url, $options);
+      if (parse_url($item->url, PHP_URL_SCHEME)) {
+        $url = Url::unrouted($item->url, $options);
+      }
+      elseif ($item->url == '<front>') {
+        $url = new Url('<front>');
+      }
+      else {
+        // No base path - assume internal.
+        $url = Url::createFromRequest(Request::create('/' . ltrim($item->url, '/')));
+      }
     }
     else {
       $url = Url::routed($item->route_name, (array) $item->route_parameters, (array) $options);