Provides form for block instance forms when used in the off-canvas tray.
This form removes advanced sections of regular block form such as the visibility settings, machine ID and region.
Hierarchy
class \Drupal\Core\Form\FormBase implements ContainerInjectionInterface, FormInterface uses DependencySerializationTrait, LoggerChannelTrait, LinkGeneratorTrait, RedirectDestinationTrait, UrlGeneratorTrait, StringTranslationTraitclass \Drupal\Core\Entity\EntityForm implements EntityFormInterfaceclass