Issue #700696 by claudiu.cristea, willvincent, swentel, pyrollo, StepanKuzmin:...

Issue #700696 by claudiu.cristea, willvincent, swentel, pyrollo, StepanKuzmin: Add 'flush' back into image module.

core/modules/image/image.routing.yml

@@ -20,6 +20,14 @@ image.style_delete:
   requirements:
     _permission: 'administer image styles'
 
+image.style_flush:
+  path: '/admin/config/media/image-styles/manage/{image_style}/flush'
+  defaults:
+    _entity_form: 'image_style.flush'
+    _title: 'Flush'
+  requirements:
+    _permission: 'administer image styles'
+
 image.effect_delete:
   path: '/admin/config/media/image-styles/manage/{image_style}/effects/{image_effect}/delete'
   defaults:

core/modules/image/lib/Drupal/image/Entity/ImageStyle.php

@@ -28,7 +28,8 @@
  *     "form" = {
  *       "add" = "Drupal\image\Form\ImageStyleAddForm",
  *       "edit" = "Drupal\image\Form\ImageStyleEditForm",
- *       "delete" = "Drupal\image\Form\ImageStyleDeleteForm"
+ *       "delete" = "Drupal\image\Form\ImageStyleDeleteForm",
+ *       "flush" = "Drupal\image\Form\ImageStyleFlushForm"
  *     },
  *     "storage" = "Drupal\Core\Config\Entity\ConfigStorageController",
  *     "list" = "Drupal\image\ImageStyleListController",

core/modules/image/lib/Drupal/image/Form/ImageStyleFlushForm.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\image\Form\ImageStyleFlushForm.
+ */
+
+namespace Drupal\image\Form;
+
+use Drupal\Core\Entity\EntityConfirmFormBase;
+
+/**
+ * Form controller for image style flush.
+ */
+class ImageStyleFlushForm extends EntityConfirmFormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return $this->t('Are you sure you want to apply the updated %name image effect to all images?', array('%name' => $this->entity->label()));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDescription() {
+    return $this->t('This operation does not change the original images but the copies created for this style will be recreated.');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfirmText() {
+    return $this->t('Flush');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCancelRoute() {
+    return array(
+      'route_name' => 'image.style_list',
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submit(array $form, array &$form_state) {
+    $this->entity->flush();
+    drupal_set_message($this->t('The image style %name has been flushed.', array('%name' => $this->entity->label())));
+    $form_state['redirect'] = 'admin/config/media/image-styles';
+  }
+
+}

core/modules/image/lib/Drupal/image/ImageStyleListController.php

@@ -77,6 +77,21 @@ public function buildRow(EntityInterface $entity) {
     return $row + parent::buildRow($entity);
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getOperations(EntityInterface $entity) {
+    $uri = $entity->uri('edit-form');
+    $flush = array(
+      'title' => t('Flush'),
+      'href' => $uri['path'] . '/flush',
+      'options' => $uri['options'],
+      'weight' => 200,
+    );
+
+    return parent::getOperations($entity) + array('flush' => $flush);
+  }
+
   /**
    * {@inheritdoc}
    */

core/modules/image/lib/Drupal/image/Tests/ImageAdminStylesTest.php

@@ -353,6 +353,37 @@ function testEditEffect() {
     $this->assertResponse(404);
   }
 
+  /**
+   * Test flush user interface.
+   */
+  public function testFlushUserInterface() {
+    $admin_path = 'admin/config/media/image-styles';
+
+    // Create a new style.
+    $style_name = strtolower($this->randomName(10));
+    $style = entity_create('image_style', array('name' => $style_name, 'label' => $this->randomString()));
+    $style->save();
+
+    // Create an image to make sure it gets flushed.
+    $files = $this->drupalGetTestFiles('image');
+    $image_uri = $files[0]->uri;
+    $derivative_uri = $style->buildUri($image_uri);
+    $this->assertTrue($style->createDerivative($image_uri, $derivative_uri));
+    $this->assertEqual($this->getImageCount($style), 1);
+
+    // Go to image styles list page and check if the flush operation link
+    // exists.
+    $this->drupalGet($admin_path);
+    $flush_path = $admin_path . '/manage/' . $style_name . '/flush';
+    $this->assertLinkByHref($flush_path);
+
+    // Flush the image style derivatives using the user interface.
+    $this->drupalPostForm($flush_path, array(), t('Flush'));
+
+    // The derivative image file should have been deleted.
+    $this->assertEqual($this->getImageCount($style), 0);
+  }
+
   /**
    * Tests image style configuration import that does a delete.
    */