--- /dev/null
+<?php
+
+namespace Drupal\comment\Form;
+
+use Drupal\Core\Entity\ContentEntityDeleteForm;
+
+/**
+ * Provides the comment delete confirmation form.
+ */
+class DeleteForm extends ContentEntityDeleteForm {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getCancelUrl() {
+ // Point to the entity of which this comment is a reply.
+ return $this->entity->get('entity_id')->entity->urlInfo();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function getRedirectUrl() {
+ return $this->getCancelUrl();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getDescription() {
+ return $this->t('Any replies to this comment will be lost. This action cannot be undone.');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function getDeletionMessage() {
+ return $this->t('The comment and all its replies have been deleted.');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function logDeletionMessage() {
+ $this->logger('comment')->notice('Deleted comment @cid and its replies.', ['@cid' => $this->entity->id()]);
+ }
+
+}