Drupal 11 support

src/Form/ResponsiveEditorImageDialog.php

-<?php
-
-namespace Drupal\inline_responsive_images\Form;
-
-use Drupal\Core\Form\FormStateInterface;
-use Drupal\Core\Ajax\AjaxResponse;
-use Drupal\Core\Ajax\HtmlCommand;
-use Drupal\editor\Ajax\EditorDialogSave;
-use Drupal\Core\Ajax\CloseModalDialogCommand;
-use Drupal\editor\Form\EditorImageDialog;
-
-/**
- * Provides an image dialog for CKE4 text editors.
- */
-class ResponsiveEditorImageDialog extends EditorImageDialog {
-
-  /**
-   * {@inheritdoc}
-   */
-  public function submitForm(array &$form, FormStateInterface $form_state) {
-    $response = new AjaxResponse();
-
-    // Convert any uploaded files from the FID values to data-entity-uuid
-    // attributes and set data-entity-type to 'file'.
-    $fid = $form_state->getValue(['fid', 0]);
-    if (!empty($fid)) {
-      $file = $this->fileStorage->load($fid);
-      $file_url = \Drupal::service('file_url_generator')->generateAbsoluteString($file->getFileUri());
-      // Transform absolute image URLs to relative image URLs: prevent problems
-      // on multisite set-ups and prevent mixed content errors.
-      $file_url = \Drupal::service('file_url_generator')->transformRelative($file_url);
-      $form_state->setValue(['attributes', 'src'], $file_url);
-      $form_state->setValue(['attributes', 'data-entity-uuid'], $file->uuid());
-      $form_state->setValue(['attributes', 'data-entity-type'], 'file');
-    }
-
-    // When the alt attribute is set to two double quotes, transform it to the
-    // empty string: two double quotes signify "empty alt attribute". See above.
-    if (trim($form_state->getValue(['attributes', 'alt'])) === '""') {
-      $form_state->setValue(['attributes', 'alt'], '');
-    }
-
-    if ($form_state->getErrors()) {
-      unset($form['#prefix'], $form['#suffix']);
-      $form['status_messages'] = [
-        '#type' => 'status_messages',
-        '#weight' => -10,
-      ];
-      $response->addCommand(new HtmlCommand('#editor-image-dialog-form', $form));
-    }
-    else {
-      $response->addCommand(new EditorDialogSave($form_state->getValues()));
-      $response->addCommand(new CloseModalDialogCommand());
-    }
-
-    return $response;
-  }
-
-}