WooCommerce view/filter all refunded orders (including partially refunded)

functions.php

<?php
add_filter( 'views_edit-shop_order', 'wpo_wc_show_all_refunded_orders', 10, 1 );
function wpo_wc_show_all_refunded_orders ($views) {
	$title = __('All refunded');
	$views['all-refunded'] = sprintf( '<a href="edit.php?post_status=wc-refunded&post_type=shop_order&all-refunded=true">%s</a>', $title );
	return $views;
}

add_filter( 'request', 'wpo_wc_show_all_refunded_orders_request' );
function wpo_wc_show_all_refunded_orders_request( $query_vars ) {
	if ( is_admin() && !empty( $_GET[ 'all-refunded' ] ) && ! empty( $query_vars['post_type'] ) && $query_vars['post_type'] == 'shop_order' ) {
		$refund_ids = wpo_get_wc_orders_with_refunds();
		$query_vars = array_merge( $query_vars, array(
			'post_status'  => ['wc-completed','wc-refunded'],
			'post__in' => $refund_ids,
		) );
	}
	return $query_vars;
}

function wpo_get_wc_orders_with_refunds() {
	$query_args = array(
		'fields'         => 'id=>parent',
		'post_type'      => 'shop_order_refund',
		'post_status'    => 'any',
		'posts_per_page' => -1,
	);
	$refunds = get_posts( $query_args );
	
	return array_values( array_unique( $refunds ) );
}