Issue #2294771 by tim.plunkett | anavarre: Fixed Add views display always defaults to attachment.

core/modules/views/src/Views.php

@@ -157,7 +157,7 @@ public static function fetchPluginNames($type, $key = NULL, array $base = array(
       }
 
       if (empty($plugin['no_ui']) && (empty($base) || empty($plugin['base']) || array_intersect($base, $plugin['base']))) {
-        $plugins[$id] = $plugin['title'];
+        $plugins[$id] = (string) $plugin['title'];
       }
     }
 

core/modules/views_ui/src/Tests/DisplayTest.php

@@ -167,6 +167,7 @@ public function testLinkDisplay() {
 
     // Test the default link_url value for new display
     $this->drupalPostForm(NULL, array(), t('Add Block'));
+    $this->assertUrl('admin/structure/views/view/test_display/edit/block_2');
     $this->clickLink(t('Custom URL'));
     $this->assertFieldByName('link_url', 'a-custom-url');
   }