Woocommerce Удалить предыдущий переменный продукт в корзине, если продукт был изменен

Question

Если в корзину добавлен переменный продукт, и я хочу отредактировать его (я добавил кнопку редактирования для всех продуктов корзины). Если изменяется только количество, оно работает нормально, но если некоторые значения в поле изменяются, скорее добавляется новый продукт.чем редактировать уже добавленный продукт. Вот код добавления в корзину в wp-content / plugins / woocommerce / includes / class-wc-cart.php

public function add_to_cart( $product_id = 0, $quantity = 1, $variation_id = 0, $variation = array(), $cart_item_data = array() ) {
                try {
                    $product_id   = absint( $product_id );
                    $variation_id = absint( $variation_id );

                    // Ensure we don't add a variation to the cart directly by variation ID.
                    if ( 'product_variation' === get_post_type( $product_id ) ) {
                        $variation_id = $product_id;
                        $product_id   = wp_get_post_parent_id( $variation_id );
                    }

                    $product_data = wc_get_product( $variation_id ? $variation_id : $product_id );
                    $quantity     = apply_filters( 'woocommerce_add_to_cart_quantity', $quantity, $product_id );

                    if ( $quantity <= 0 || ! $product_data || 'trash' === $product_data->get_status() ) {
                        return false;
                    }

                    // Load cart item data - may be added by other plugins.
                    $cart_item_data = (array) apply_filters( 'woocommerce_add_cart_item_data', $cart_item_data, $product_id, $variation_id, $quantity );

                    // Generate a ID based on product ID, variation ID, variation data, and other cart item data.
                    $cart_id = $this->generate_cart_id( $product_id, $variation_id, $variation, $cart_item_data );

                    // Find the cart item key in the existing cart.
                    $cart_item_key = $this->find_product_in_cart( $cart_id );

                    // Force quantity to 1 if sold individually and check for existing item in cart.
                    if ( $product_data->is_sold_individually() ) {
                        $quantity      = apply_filters( 'woocommerce_add_to_cart_sold_individually_quantity', 1, $quantity, $product_id, $variation_id, $cart_item_data );
                        $found_in_cart = apply_filters( 'woocommerce_add_to_cart_sold_individually_found_in_cart', $cart_item_key && $this->cart_contents[ $cart_item_key ]['quantity'] > 0, $product_id, $variation_id, $cart_item_data, $cart_id );

                        if ( $found_in_cart ) {
                            /* translators: %s: product name */
                            throw new Exception( sprintf( '<a href="%s" class="button wc-forward">%s</a> %s', wc_get_cart_url(), __( 'View cart', 'woocommerce' ), sprintf( __( 'You cannot add another "%s" to your cart.', 'woocommerce' ), $product_data->get_name() ) ) );
                        }
                    }

                    if ( ! $product_data->is_purchasable() ) {
                        throw new Exception( __( 'Sorry, this product cannot be purchased.', 'woocommerce' ) );
                    }

                    // Stock check - only check if we're managing stock and backorders are not allowed.
                    if ( ! $product_data->is_in_stock() ) {
                        /* translators: %s: product name */
                        throw new Exception( sprintf( __( 'You cannot add &quot;%s&quot; to the cart because the product is out of stock.', 'woocommerce' ), $product_data->get_name() ) );
                    }

                    if ( ! $product_data->has_enough_stock( $quantity ) ) {
                        /* translators: 1: product name 2: quantity in stock */
                        throw new Exception( sprintf( __( 'You cannot add that amount of &quot;%1$s&quot; to the cart because there is not enough stock (%2$s remaining).', 'woocommerce' ), $product_data->get_name(), wc_format_stock_quantity_for_display( $product_data->get_stock_quantity(), $product_data ) ) );
                    }

                    // Stock check - this time accounting for whats already in-cart.
                    if ( $product_data->managing_stock() ) {
                        $products_qty_in_cart = $this->get_cart_item_quantities();

                        if ( isset( $products_qty_in_cart[ $product_data->get_stock_managed_by_id() ] ) && ! $product_data->has_enough_stock( $products_qty_in_cart[ $product_data->get_stock_managed_by_id() ] + $quantity ) ) {
                            throw new Exception(
                                sprintf(
                                    '<a href="%s" class="button wc-forward">%s</a> %s',
                                    wc_get_cart_url(),
                                    __( 'View cart', 'woocommerce' ),
                                    /* translators: 1: quantity in stock 2: current quantity */
                                    sprintf( __( 'You cannot add that amount to the cart &mdash; we have %1$s in stock and you already have %2$s in your cart.', 'woocommerce' ), wc_format_stock_quantity_for_display( $product_data->get_stock_quantity(), $product_data ), wc_format_stock_quantity_for_display( $products_qty_in_cart[ $product_data->get_stock_managed_by_id() ], $product_data ) )
                                )
                            );
                        }
                    }

                    // If cart_item_key is set, the item is already in the cart.
                    if ( $cart_item_key ) {
                        //$new_quantity = $quantity + $this->cart_contents[ $cart_item_key ]['quantity'];
                                        $new_quantity = $quantity;
                        $this->set_quantity( $cart_item_key, $new_quantity, false );
                    } else {

                        $cart_item_key = $cart_id;

                        // Add item after merging with $cart_item_data - hook to allow plugins to modify cart item.
                        $this->cart_contents[ $cart_item_key ] = apply_filters(
                            'woocommerce_add_cart_item',
                            array_merge(
                                $cart_item_data,
                                array(
                                    'key'          => $cart_item_key,
                                    'product_id'   => $product_id,
                                    'variation_id' => $variation_id,
                                    'variation'    => $variation,
                                    'quantity'     => $quantity,
                                    'data'         => $product_data,
                                    'data_hash'    => wc_get_cart_item_data_hash( $product_data ),
                                )
                            ),
                            $cart_item_key
                        );
                    }

                    $this->cart_contents = apply_filters( 'woocommerce_cart_contents_changed', $this->cart_contents );


                    do_action( 'woocommerce_add_to_cart', $cart_item_key, $product_id, $quantity, $variation_id, $variation, $cart_item_data );

                    return $cart_item_key;

                } catch ( Exception $e ) {
                    if ( $e->getMessage() ) {
                        wc_add_notice( $e->getMessage(), 'error' );
                    }
                    return false;
                }
            }