public function displayBlock(Event $event, $block, $options = [])
    {
        return $this->trigger(['Block.Menu.display', $event->subject()], $block, $options)->result;
    }
public function displayBlock(Event $event, $block, $options = [])
    {
        return $this->trigger(['Block.Menu.display', $event->subject()], $block, $options)->result;
    }
public function displayBlock ( Event $ event , $ block , $ options = [ ] ) { return $ this -> trigger ( [ 'Block.Menu.display' , $ event -> subject ( ) ] , $ block , $ options ) -> result ; }
All blocks registered by "System" plugin are associated blocks
of some core's menus. So we redirect rendering task to Menu plugin's render.

@param \Cake\Event\Event $event The event that was triggered
@param \Block\Model\Entity\Block $block The block being rendered
@param array $options Array of additional options
@return array
All blocks registered by System plugin are associated blocks of some core s menus . So we redirect rendering task to Menu plugin s render .