commit 9781c74965c03f7be948098115b4fc1aa8e0e348
Author: Bart Feenstra <bart@mynameisbart.com>
Date:   Tue Apr 29 10:15:27 2014 +0200

    foo

diff --git a/core/lib/Drupal/Core/Entity/EntityListBuilder.php b/core/lib/Drupal/Core/Entity/EntityListBuilder.php
index b7b1347..80bc999 100644
--- a/core/lib/Drupal/Core/Entity/EntityListBuilder.php
+++ b/core/lib/Drupal/Core/Entity/EntityListBuilder.php
@@ -123,6 +123,10 @@ protected function getDefaultOperations(EntityInterface $entity) {
       $operations['delete'] = array(
         'title' => $this->t('Delete'),
         'weight' => 100,
+        'attributes' => array(
+          'class' => array('use-ajax'),
+          'data-accepts' => 'application/vnd.drupal-modal',
+        ),
       ) + $entity->urlInfo('delete-form')->toArray();
     }
 
@@ -173,6 +177,10 @@ public function buildOperations(EntityInterface $entity) {
     $build = array(
       '#type' => 'operations',
       '#links' => $this->getOperations($entity),
+      // Allow links to use modals.
+      '#attached' => array(
+        'library' => array('core/drupal.ajax'),
+      ),
     );
 
     return $build;
diff --git a/core/lib/Drupal/Core/Form/ConfirmFormHelper.php b/core/lib/Drupal/Core/Form/ConfirmFormHelper.php
index 1b1fa30..3ff5247 100644
--- a/core/lib/Drupal/Core/Form/ConfirmFormHelper.php
+++ b/core/lib/Drupal/Core/Form/ConfirmFormHelper.php
@@ -62,6 +62,10 @@ public static function buildCancelLink(ConfirmFormInterface $form, Request $requ
 
     $link['#type'] = 'link';
     $link['#title'] = $form->getCancelText();
+    $link['#attributes'] = array(
+      'class' => array('dialog-cancel'),
+    );
+
     return $link;
   }