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Expanded class hierarchy of HelpBlock in Drupal 10

class \Drupal\Component\Plugin\PluginBase implements DerivativeInspectionInterface, PluginInspectionInterface
- class \Drupal\Core\Menu\ContextualLinkDefault implements ContextualLinkInterface
- class \Drupal\Core\Menu\LocalActionDefault implements CacheableDependencyInterface, LocalActionInterface, ContainerFactoryPluginInterface uses DependencySerializationTrait
- class \Drupal\Core\Menu\LocalTaskDefault implements CacheableDependencyInterface, LocalTaskInterface uses DependencySerializationTrait
- class \Drupal\Core\Plugin\PluginBase uses DependencySerializationTrait, MessengerTrait, StringTranslationTrait
  - class \Drupal\breakpoint\Breakpoint implements BreakpointInterface
  - class \Drupal\ckeditor5\Plugin\CKEditor5PluginDefault implements CKEditor5PluginInterface
  - class \Drupal\ckeditor\CKEditorPluginBase implements CKEditorPluginButtonsInterface, CKEditorPluginInterface
  - class \Drupal\ckeditor\Plugin\CKEditorPlugin\DrupalMedia implements CKEditorPluginContextualInterface, CKEditorPluginCssInterface, ContainerFactoryPluginInterface
  - class \Drupal\config_translation\ConfigNamesMapper implements ConfigMapperInterface, ContainerFactoryPluginInterface
  - class \Drupal\Core\Action\ActionBase implements ActionInterface
  - class \Drupal\Core\Block\BlockBase implements BlockPluginInterface, ContextAwarePluginInterface, PluginWithFormsInterface, PreviewAwarePluginInterface, PreviewFallbackInterface uses BlockPluginTrait, ContextAwarePluginAssignmentTrait, ContextAwarePluginTrait
    class \Drupal\ajax_forms_test\Plugin\Block\AjaxFormBlock implements FormInterface, ContainerFactoryPluginInterface
    
    class \Drupal\block_test\Plugin\Block\TestAccessBlock implements ContainerFactoryPluginInterface
    
    class \Drupal\block_test\Plugin\Block\TestBlockInstantiation
    
    class \Drupal\block_test\Plugin\Block\TestCacheBlock
    
    class \Drupal\block_test\Plugin\Block\TestContextAwareBlock
    
    class \Drupal\block_test\Plugin\Block\TestContextAwareNoValidContextOptionsBlock
    
    class \Drupal\block_test\Plugin\Block\TestContextAwareUnsatisfiedBlock
    
    class \Drupal\block_test\Plugin\Block\TestFormBlock
    
    class \Drupal\block_test\Plugin\Block\TestHtmlBlock
    
    class \Drupal\block_test\Plugin\Block\TestMultipleFormsBlock
    
    class \Drupal\block_test\Plugin\Block\TestSettingsValidationBlock
    
    class \Drupal\form_test\Plugin\Block\RedirectFormBlock implements ContainerFactoryPluginInterface
    
    class \Drupal\help\Plugin\Block\HelpBlock implements ContainerFactoryPluginInterface
    
    class \Drupal\language\Plugin\Block\LanguageBlock implements ContainerFactoryPluginInterface
    
    class \Drupal\layout_builder\Plugin\Block\ExtraFieldBlock implements ContainerFactoryPluginInterface, ContextAwarePluginInterface
    
    class \Drupal\layout_builder\Plugin\Block\InlineBlock implements RefinableDependentAccessInterface, ContainerFactoryPluginInterface uses RefinableDependentAccessTrait
    
    class \Drupal\layout_builder_form_block_test\Plugin\Block\TestFormApiFormBlock implements FormInterface, ContainerFactoryPluginInterface
    
    class \Drupal\layout_builder_form_block_test\Plugin\Block\TestInlineTemplateFormBlock
    
    class \Drupal\layout_builder_test\Plugin\Block\IHaveRuntimeContexts
    
    class \Drupal\layout_builder_test\Plugin\Block\PreviewAwareBlock
    
    class \Drupal\layout_builder_test\Plugin\Block\TestAjaxBlock
    
    class \Drupal\layout_builder_test\Plugin\Block\TestAttributesBlock
    
    class \Drupal\node\Plugin\Block\SyndicateBlock implements ContainerFactoryPluginInterface
    
    class \Drupal\node_block_test\Plugin\Block\NodeContextTestBlock
    
    class \Drupal\render_attached_test\Plugin\Block\AttachedRenderingBlock
    
    class \Drupal\search\Plugin\Block\SearchBlock implements ContainerFactoryPluginInterface
    
    class \Drupal\settings_tray_test\Plugin\Block\SettingsTrayFormAnnotationIsClassBlock
    
    class \Drupal\settings_tray_test\Plugin\Block\SettingsTrayFormAnnotationIsFalseBlock
    
    class \Drupal\settings_tray_test\Plugin\Block\SettingsTrayFormAnnotationNoneBlock
    
    class \Drupal\settings_tray_test\Plugin\Block\ValidationErrorBlock
    
    class \Drupal\shortcut\Plugin\Block\ShortcutsBlock
    
    class \Drupal\statistics\Plugin\Block\StatisticsPopularBlock implements ContainerFactoryPluginInterface
    
    class \Drupal\system\Plugin\Block\SystemBrandingBlock implements ContainerFactoryPluginInterface
    
    class \Drupal\system\Plugin\Block\SystemBreadcrumbBlock implements ContainerFactoryPluginInterface
    
    class \Drupal\system\Plugin\Block\SystemMainBlock implements MainContentBlockPluginInterface
    
    class \Drupal\system\Plugin\Block\SystemMenuBlock implements ContainerFactoryPluginInterface
    
    class \Drupal\system\Plugin\Block\SystemMessagesBlock implements MessagesBlockPluginInterface
    
    class \Drupal\system\Plugin\Block\SystemPoweredByBlock
    
    class \Drupal\user\Plugin\Block\UserLoginBlock implements ContainerFactoryPluginInterface, TrustedCallbackInterface uses RedirectDestinationTrait
    
    class \Drupal\views\Plugin\Block\ViewsBlockBase implements ContainerFactoryPluginInterface
    
    class \Drupal\workspaces\Plugin\Block\WorkspaceSwitcherBlock implements ContainerFactoryPluginInterface
  - class \Drupal\Core\Display\VariantBase implements VariantInterface uses RefinableCacheableDependencyTrait, PluginDependencyTrait
  - class \Drupal\Core\Entity\EntityReferenceSelection\SelectionPluginBase implements ConfigurableInterface, DependentPluginInterface, SelectionInterface
  - class \Drupal\Core\Executable\ExecutablePluginBase implements CacheableDependencyInterface, ExecutableInterface, ContextAwarePluginInterface uses ContextAwarePluginTrait
  - class \Drupal\Core\Field\PluginSettingsBase implements DependentPluginInterface, PluginSettingsInterface
  - class \Drupal\Core\Http\LinkRelationType implements LinkRelationTypeInterface
  - class \Drupal\Core\ImageToolkit\ImageToolkitBase implements ImageToolkitInterface
  - class \Drupal\Core\ImageToolkit\ImageToolkitOperationBase implements ImageToolkitOperationInterface
  - class \Drupal\Core\Layout\LayoutDefault implements LayoutInterface, PluginFormInterface, PreviewAwarePluginInterface uses ContextAwarePluginAssignmentTrait, ContextAwarePluginTrait
  - class \Drupal\Core\Menu\MenuLinkBase implements MenuLinkInterface
  - class \Drupal\Core\Render\Element\RenderElement implements ElementInterface
  - class \Drupal\editor\Plugin\EditorBase implements EditorPluginInterface
  - class \Drupal\filter\Plugin\FilterBase implements FilterInterface
  - class \Drupal\help\Plugin\HelpSection\HelpSectionPluginBase implements HelpSectionPluginInterface uses UnchangingCacheableDependencyTrait
  - class \Drupal\help_topics\HelpTopicPluginBase implements HelpTopicPluginInterface
  - class \Drupal\image\ImageEffectBase implements ContainerFactoryPluginInterface, ImageEffectInterface
  - class \Drupal\KernelTests\Core\Plugin\TestContextAwarePlugin implements ContextAwarePluginInterface uses ContextAwarePluginTrait
  - class \Drupal\layout_builder\Plugin\SectionStorage\SectionStorageBase implements CacheableDependencyInterface, SectionStorageInterface, TempStoreIdentifierInterface uses ContextAwarePluginTrait, LayoutBuilderRoutesTrait
  - class \Drupal\layout_builder_test\Plugin\SectionStorage\SimpleConfigSectionStorage implements ContainerFactoryPluginInterface, SectionStorageLocalTaskProviderInterface, SectionStorageInterface uses ContextAwarePluginTrait, LayoutBuilderRoutesTrait, SectionListTrait
  - class \Drupal\media\MediaSourceBase implements ContainerFactoryPluginInterface, MediaSourceInterface
  - class \Drupal\migrate\Plugin\migrate\destination\DestinationBase implements MigrateDestinationInterface, RequirementsInterface
  - class \Drupal\migrate\Plugin\migrate\id_map\NullIdMap implements MigrateIdMapInterface
  - class \Drupal\migrate\Plugin\migrate\id_map\Sql implements ContainerFactoryPluginInterface, HighestIdInterface, MigrateIdMapInterface
  - class \Drupal\migrate\Plugin\migrate\source\SourcePluginBase implements RollbackAwareInterface, MigrateSourceInterface
  - class \Drupal\migrate\Plugin\Migration implements ContainerFactoryPluginInterface, MigrationInterface, RequirementsInterface
  - class \Drupal\migrate\ProcessPluginBase implements MigrateProcessInterface
  - class \Drupal\migrate_drupal\Plugin\migrate\field\FieldPluginBase implements MigrateFieldInterface
  - class \Drupal\plugin_test\Plugin\plugin_test\mock_block\MockComplexContextBlock implements ContextAwarePluginInterface uses ContextAwarePluginTrait
  - class \Drupal\plugin_test\Plugin\plugin_test\mock_block\MockUserNameBlock implements ContextAwarePluginInterface uses ContextAwarePluginTrait
  - class \Drupal\plugin_test\Plugin\plugin_test\mock_block\TypedDataStringBlock implements ContextAwarePluginInterface uses ContextAwarePluginTrait
  - class \Drupal\quickedit\Plugin\InPlaceEditorBase implements InPlaceEditorInterface
  - class \Drupal\rest\Plugin\ResourceBase implements ContainerFactoryPluginInterface, ResourceInterface
  - class \Drupal\search\Plugin\SearchPluginBase implements RefinableCacheableDependencyInterface, ContainerFactoryPluginInterface, SearchInterface uses RefinableCacheableDependencyTrait
  - class \Drupal\tour\TipPluginBase implements TipPluginInterface
  - class \Drupal\views\Plugin\views\join\JoinPluginBase implements JoinPluginInterface
  - class \Drupal\views\Plugin\views\PluginBase implements DependentPluginInterface, ContainerFactoryPluginInterface, TrustedCallbackInterface, ViewsPluginInterface
- class \Drupal\Core\Queue\QueueWorkerBase implements QueueWorkerInterface
- class \Drupal\entity_test\Plugin\Validation\Constraint\EntityTestDefaultPlugin
- class \Drupal\plugin_test\Plugin\plugin_test\mock_block\MockLayoutBlock
- class \Drupal\plugin_test\Plugin\plugin_test\mock_block\MockTestBlock
- class \Drupal\plugin_test\Plugin\plugin_test\mock_block\MockUserLoginBlock
- class \Drupal\quickedit\Plugin\InPlaceEditor\Editor implements InPlaceEditorInterface
- class \Drupal\Tests\Core\Plugin\ConfigurablePlugin implements ConfigurableInterface
- class \Drupal\Tests\Core\Plugin\TestClass implements PluginFormInterface, PluginWithFormsInterface uses PluginWithFormsTrait
- class \Drupal\workflows\Plugin\WorkflowTypeBase implements WorkflowTypeInterface uses PluginWithFormsTrait