WP_Customize_Nav_Menu_Item_Setting::update( array|false $value ): null|void

770	protected function update( $value ) {771		if ( $this->is_updated ) {772			return;773		}774 775		$this->is_updated = true;776		$is_placeholder   = ( $this->post_id < 0 );777		$is_delete        = ( false === $value );778 779		// Update the cached value.780		$this->value = $value;781 782		add_filter( 'customize_save_response', array( $this, 'amend_customize_save_response' ) );783 784		if ( $is_delete ) {785			// If the current setting post is a placeholder, a delete request is a no-op.786			if ( $is_placeholder ) {787				$this->update_status = 'deleted';788			} else {789				$r = wp_delete_post( $this->post_id, true );790 791				if ( false === $r ) {792					$this->update_error  = new WP_Error( 'delete_failure' );793					$this->update_status = 'error';794				} else {795					$this->update_status = 'deleted';796				}797				// @todo send back the IDs for all associated nav menu items deleted, so these settings (and controls) can be removed from Customizer?798			}799		} else {800 801			// Handle saving menu items for menus that are being newly-created.802			if ( $value['nav_menu_term_id'] < 0 ) {803				$nav_menu_setting_id = sprintf( 'nav_menu[%s]', $value['nav_menu_term_id'] );804				$nav_menu_setting    = $this->manager->get_setting( $nav_menu_setting_id );805 806				if ( ! $nav_menu_setting || ! ( $nav_menu_setting instanceof WP_Customize_Nav_Menu_Setting ) ) {807					$this->update_status = 'error';808					$this->update_error  = new WP_Error( 'unexpected_nav_menu_setting' );809					return;810				}811 812				if ( false === $nav_menu_setting->save() ) {813					$this->update_status = 'error';814					$this->update_error  = new WP_Error( 'nav_menu_setting_failure' );815					return;816				}817 818				if ( (int) $value['nav_menu_term_id'] !== $nav_menu_setting->previous_term_id ) {819					$this->update_status = 'error';820					$this->update_error  = new WP_Error( 'unexpected_previous_term_id' );821					return;822				}823 824				$value['nav_menu_term_id'] = $nav_menu_setting->term_id;825			}826 827			// Handle saving a nav menu item that is a child of a nav menu item being newly-created.828			if ( $value['menu_item_parent'] < 0 ) {829				$parent_nav_menu_item_setting_id = sprintf( 'nav_menu_item[%s]', $value['menu_item_parent'] );830				$parent_nav_menu_item_setting    = $this->manager->get_setting( $parent_nav_menu_item_setting_id );831 832				if ( ! $parent_nav_menu_item_setting || ! ( $parent_nav_menu_item_setting instanceof WP_Customize_Nav_Menu_Item_Setting ) ) {833					$this->update_status = 'error';834					$this->update_error  = new WP_Error( 'unexpected_nav_menu_item_setting' );835					return;836				}837 838				if ( false === $parent_nav_menu_item_setting->save() ) {839					$this->update_status = 'error';840					$this->update_error  = new WP_Error( 'nav_menu_item_setting_failure' );841					return;842				}843 844				if ( (int) $value['menu_item_parent'] !== $parent_nav_menu_item_setting->previous_post_id ) {845					$this->update_status = 'error';846					$this->update_error  = new WP_Error( 'unexpected_previous_post_id' );847					return;848				}849