Error adding or editing the field Draggableviews: Content

Problem/Motivation

Error on save, edit or delete the field Draggableviews: Content on Drupal 9.3.2.

TypeError: array_filter(): Argument #1 ($array) must be of type array, null given en array_filter() (line 243 de /web/core/modules/views/src/Plugin/views/field/BulkForm.php)

Steps to reproduce

Add field or edit Draggableviews: Content field, try to save settings of it.

Proposed resolution

Reviewing the error trace i found that the core class BulkForm manipulate the form_state values 'options' and 'selected_actions' and that generate the error since DraggableViewsField class unset that fields.

core/modules/views/src/Plugin/views/field/BulkForm.php

  /**
   * {@inheritdoc}
   */
  public function validateOptionsForm(&$form, FormStateInterface $form_state) {
    parent::validateOptionsForm($form, $form_state);

    $selected_actions = $form_state->getValue(['options', 'selected_actions']);
    $form_state->setValue(['options', 'selected_actions'], array_values(array_filter($selected_actions)));
  }

modules/contrib/draggableviews/src/Plugin/views/field/DraggableViewsField.php

  /**
   * {@inheritdoc}
   */
  public function buildOptionsForm(&$form, FormStateInterface $form_state) {
    $form['draggableview_help'] = [
      '#markup' => $this->t("A draggable element will be added to the first table column. You do not have to set this field as the first column in your View."),
    ];
    parent::buildOptionsForm($form, $form_state);
    // Remove all the fields that would break this or are completely ignored
    // when rendering the drag interface.
    unset($form['custom_label']);
    unset($form['label']);
    unset($form['element_label_colon']);
    unset($form['action_title']);
    unset($form['include_exclude']);
    unset('selected_actions');
    unset($form['exclude']);
    unset($form['alter']);
    unset($form['empty_field_behavior']);
    unset($form['empty']);
    unset($form['empty_zero']);
    unset($form['hide_empty']);
    unset($form['hide_alter_empty']);
  }

I think a solution is not remove the fields by using unset, instead block the access of the fields by the property #access.

  /**
   * {@inheritdoc}
   */
  public function buildOptionsForm(&$form, FormStateInterface $form_state) {
    $form['draggableview_help'] = [
      '#markup' => $this->t("A draggable element will be added to the first table column. You do not have to set this field as the first column in your View."),
    ];
    parent::buildOptionsForm($form, $form_state);
    // Remove all the fields that would break this or are completely ignored
    // when rendering the drag interface.
    $form['custom_label']['#access'] = FALSE;
    $form['label']['#access'] = FALSE;
    $form['element_label_colon']['#access'] = FALSE;
    $form['action_title']['#access'] = FALSE;
    $form['include_exclude']['#access'] = FALSE;
    $form['selected_actions']['#access'] = FALSE;
    $form['exclude']['#access'] = FALSE;
    $form['alter']['#access'] = FALSE;
    $form['empty_field_behavior']['#access'] = FALSE;
    $form['empty']['#access'] = FALSE;
    $form['empty_zero']['#access'] = FALSE;
    $form['hide_empty']['#access'] = FALSE;
    $form['hide_alter_empty']['#access'] = FALSE;
  }