Issue #3516018: The title for layout_builder blocks can't be edited

Closes #3516018

frontend_editing.module

@@ -5,6 +5,7 @@
  * Functions and hooks for the frontend_editing module.
  */
 
+use Drupal\block_content\BlockContentInterface;
 use Drupal\Component\Utility\Color;
 use Drupal\Core\Ajax\AjaxResponse;
 use Drupal\Core\Ajax\MessageCommand;
@@ -25,6 +26,7 @@ use Drupal\frontend_editing\Ajax\EntityPreviewCommand;
 use Drupal\frontend_editing\Ajax\ScrollTopCommand;
 use Drupal\frontend_editing\Form\ParagraphAddForm;
 use Drupal\frontend_editing\Form\ParagraphDeleteForm;
+use Drupal\layout_builder\SectionComponent;
 use Drupal\paragraphs\ParagraphInterface;
 
 /**
@@ -553,6 +555,9 @@ function frontend_editing_form_alter(&$form, FormStateInterface $form_state, $fo
           ];
         }
       }
+
+      // Add new action to update layout_builder data for blocks.
+      $form['actions']['submit']['#submit'][] = '_frontend_editing_update_parent_layout_builder';
     }
   }
 }
@@ -1055,3 +1060,66 @@ function frontend_editing_gin_content_form_routes_alter(&$route_names) {
   // Allow Gin to process the form as it is content form.
   $route_names[] = 'frontend_editing.form';
 }
+
+/**
+ * Update parent entity layout builder.
+ *
+ * @param array $form
+ *   The form definition.
+ * @param \Drupal\Core\Form\FormStateInterface $form_state
+ *   The form state.
+ */
+function _frontend_editing_update_parent_layout_builder(array $form, FormStateInterface $form_state) {
+  $entity = $form_state->getBuildInfo()['callback_object']->getEntity();
+
+  // Skip if entity isn't block content.
+  if (!$entity instanceof BlockContentInterface) {
+    return;
+  }
+
+  $entity_id = $entity->id();
+  $usage = \Drupal::service('inline_block.usage')->getUsage($entity_id);
+  if (empty($usage)) {
+    return;
+  }
+
+  $langcode = \Drupal::languageManager()->getCurrentLanguage()->getId();
+  $layout_builder_field = 'layout_builder__layout';
+  $parent_entity = \Drupal::entityTypeManager()->getStorage($usage->layout_entity_type)
+    ->load($usage->layout_entity_id);
+
+  // Skip if there is no parent entity.
+  if (!$parent_entity) {
+    return;
+  }
+
+  // Get correct translation.
+  if ($parent_entity->hasTranslation($langcode)) {
+    $parent_entity = $parent_entity->getTranslation($langcode);
+  }
+
+  /** @var \Drupal\layout_builder\Section[] $sections */
+  $sections = $parent_entity->hasField($layout_builder_field)
+    ? $parent_entity->get($layout_builder_field)->getSections()
+    : [];
+
+  $updated = FALSE;
+  foreach ($sections as $section) {
+    foreach ($section->getComponents() as $component) {
+      $plugin = $component->getPlugin();
+      $configuration = $plugin->getConfiguration();
+      if ($configuration['block_id'] !== $entity->id()) {
+        continue;
+      }
+      $configuration['label'] = $entity->label();
+      $component->setConfiguration($configuration);
+      $updated = TRUE;
+      break 2;
+    }
+  }
+
+  if ($updated) {
+    $parent_entity->get($layout_builder_field)->setValue($sections);
+    $parent_entity->save();
+  }
+}