blockUpdateHighlightId example

$build = $section->toRenderArray($this->getPopulatedContexts($section_storage), TRUE);
    $layout_definition = $layout->getPluginDefinition();

    $region_labels = $layout_definition->getRegionLabels();
    foreach ($layout_definition->getRegions() as $region => $info) {
      if (!empty($build[$region])) {
        foreach (Element::children($build[$region]) as $uuid) {
          $build[$region][$uuid]['#attributes']['class'][] = 'js-layout-builder-block';
          $build[$region][$uuid]['#attributes']['class'][] = 'layout-builder-block';
          $build[$region][$uuid]['#attributes']['data-layout-block-uuid'] = $uuid;
          $build[$region][$uuid]['#attributes']['data-layout-builder-highlight-id'] = $this->blockUpdateHighlightId($uuid);
          $build[$region][$uuid]['#contextual_links'] = [
            'layout_builder_block' => [
              'route_parameters' => [
                'section_storage_type' => $storage_type,
                'section_storage' => $storage_id,
                'delta' => $delta,
                'region' => $region,
                'uuid' => $uuid,
              ],
              // Add metadata about the current operations available in               // contextual links. This will invalidate the client-side cache of

foreach ($parameters as $parameter) {
      if (is_null($parameter)) {
        throw new \InvalidArgumentException('MoveBlockForm requires all parameters.');
      }
    }

    $this->sectionStorage = $section_storage;
    $this->delta = $delta;
    $this->uuid = $uuid;
    $this->region = $region;

    $form['#attributes']['data-layout-builder-target-highlight-id'] = $this->blockUpdateHighlightId($uuid);

    $sections = $section_storage->getSections();
    $contexts = $this->getPopulatedContexts($section_storage);
    $region_options = [];
    foreach ($sections as $section_delta => $section) {
      $layout = $section->getLayout($contexts);
      $layout_definition = $layout->getPluginDefinition();
      if (!($section_label = $section->getLayoutSettings()['label'])) {
        $section_label = $this->t('Section: @delta', ['@delta' => $section_delta + 1])->render();
      }
      foreach ($layout_definition->getRegions() as $region_name => $region_info) {
        

  public function buildForm(array $form, FormStateInterface $form_state, SectionStorageInterface $section_storage = NULL, $delta = NULL, $region = NULL, $uuid = NULL) {
    $component = $section_storage->getSection($delta)->getComponent($uuid);
    $form['#attributes']['data-layout-builder-target-highlight-id'] = $this->blockUpdateHighlightId($uuid);
    return $this->doBuildForm($form, $form_state, $section_storage, $delta, $component);
  }

  /** * {@inheritdoc} */
  protected function submitLabel() {
    return $this->t('Update');
  }

}

  public function buildForm(array $form, FormStateInterface $form_state, SectionStorageInterface $section_storage = NULL, $delta = NULL) {
    $this->sectionStorage = $section_storage;
    $this->delta = $delta;

    $form = parent::buildForm($form, $form_state);

    if ($this->isAjax()) {
      $form['actions']['submit']['#ajax']['callback'] = '::ajaxSubmit';
      $form['actions']['cancel']['#attributes']['class'][] = 'dialog-cancel';
      $target_highlight_id = !empty($this->uuid) ? $this->blockUpdateHighlightId($this->uuid) : $this->sectionUpdateHighlightId($delta);
      $form['#attributes']['data-layout-builder-target-highlight-id'] = $target_highlight_id;
    }

    // Mark this as an administrative page for JavaScript ("Back to site" link).     $form['#attached']['drupalSettings']['path']['currentPathIsAdmin'] = TRUE;
    return $form;
  }

  /** * {@inheritdoc} */