Issue #2856732 by anon: Linking to files, do not use the domain?

src/Plugin/Linkit/Matcher/EntityMatcher.php

@@ -229,7 +229,7 @@ class EntityMatcher extends ConfigurableMatcherBase {
       // Check the access against the defined entity access handler.
       /** @var \Drupal\Core\Access\AccessResultInterface $access */
       $access = $entity->access('view', $this->currentUser, TRUE);
-      if ($access->isForbidden()) {
+      if (!$access->isAllowed()) {
         continue;
       }
 

src/Plugin/Linkit/Matcher/FileMatcher.php

@@ -183,6 +183,7 @@ class FileMatcher extends EntityMatcher {
    * entity interface.
    */
   protected function buildPath($entity) {
-    return $entity->url();
+    /** @var \Drupal\file\FileInterface $entity */
+    return file_url_transform_relative(file_create_url($entity->getFileUri()));
   }
 }

src/Tests/Matchers/UserMatcherTest.php

@@ -35,7 +35,7 @@ class UserMatcherTest extends LinkitTestBase {
    */
   protected function setUp() {
     parent::setUp();
-    $this->drupalLogin($this->adminUser);
+    $this->drupalLogin($this->drupalCreateUser(['access user profiles']));
     $this->manager = $this->container->get('plugin.manager.linkit.matcher');
 
     $custom_role = $this->drupalCreateRole(array(), 'custom_role', 'custom_role');