Woocommerce Undo Delete Item Redirect - php

Question

How can I redirect back to the /cart after I click the 'Undo' link when I delete an item from it?
I am not concerned if the cart is empty or not. I had to implement a template_redirect already, so when a user "removes" an item from the cart it redirects back to the cart rather than the home page. With:
add_action( 'template_redirect', function( ) {
$_var = ( $_GET[ 'removed_item' ] ) ?? null;
//var_dump($_var);
if( $_var == '1' ){
wp_safe_redirect( '/cart', 301 );
die();
}
} );
Can I hook into the same action? I don't see a query string after clicking the 'Undo' tho...
EDIT
I can see where the action is done. It's in the plugin includes/class-ws-form-handler.php, right around line 536... containing:
// Undo Cart Item
$cart_item_key = sanitize_text_field( $_GET['undo_item'] );
WC()->cart->restore_cart_item( $cart_item_key );
$referer = wp_get_referer() ? remove_query_arg( array( 'undo_item', '_wpnonce' ), wp_get_referer() ) : wc_get_cart_url();
wp_safe_redirect( $referer );
exit;
EDIT 2:
Adding the following to my redirection above does nothing...
// undo the remove, redirect back to cart
if ( ! empty( $_GET['undo_item'] ) && isset( $_GET['_wpnonce'] ) && wp_verify_nonce( $_GET['_wpnonce'], 'woocommerce-cart' ) ) {
// Undo Cart Item
$cart_item_key = sanitize_text_field( $_GET['undo_item'] );
WC()->cart->restore_cart_item( $cart_item_key );
wp_safe_redirect( wc_get_cart_url() );
exit;
}
So, when I var_dump wp_get_referer() I get back the home page of the site, which is not what I am looking for. I do not want to modify this file due to that not being that great of an idea... so, how can I just modify the action instead? The function itself is: public static function update_cart_action()

Answer 1

So... I ended up have to do some voodoo to get this to work.
Here is the hook...
// undo the remove, redirect back to cart
// check if the cart is updated... if it is, proceed
$_cu = apply_filters( 'woocommerce_update_cart_action_cart_updated', true );
if( $_cu ) {
global $woocommerce;
if ( ! empty( $_GET['undo_item'] ) && isset( $_GET['_wpnonce'] ) && wp_verify_nonce( $_GET['_wpnonce'], 'woocommerce-cart' ) ) {
// item
$cart_item_key = sanitize_text_field( $_GET['undo_item'] );
// Get the cart
$woocommerce->cart->get_cart();
// restore the item
$woocommerce->cart->restore_cart_item( $cart_item_key );
// now do the redirect
wp_safe_redirect( wc_get_cart_url() );
exit;
}
}
It is applied in the init event