In stock product variations by default

in-stock-varitaions.php

<?php
/**
 * THIS CODE IS NO LONGER WORKS 
 * PLEASE USE THE FILTER EVERYTHING PRO VERSION 1.7.15.6 OR ABOVE
 */

/**
 * Makes only In stock products visible in filtering process
 * You can put this code in the end of the functions.php file
 * of your active theme

add_action( 'wpc_filtered_query_end', 'flrt_display_products_in_stock_only' );
add_filter( 'wpc_variations_meta_query', 'flrt_display_variations_in_stock_only' );
add_action( 'wpc_all_set_wp_queried_posts', 'flrt_all_set_wp_queried_in_stock_only' );

function flrt_display_products_in_stock_only( $filtered_query ) {
    if ( $filtered_query->get('wc_query') === 'product_query' || $filtered_query->get('post_type') === 'product' ) {
        $meta_query   = $filtered_query->get('meta_query');
        $add_in_stock = true;

        if ( ! empty( $meta_query ) ) {
            foreach( $meta_query as $sub_query ) {
                if ( isset( $sub_query['key'] ) && $sub_query['key'] === '_stock_status' ) {
                    $add_in_stock = false;
                    break;
                }
            }
        }

        //@todo consider to relate with WooCommerce 'woocommerce_hide_out_of_stock_items' option value
        if ( $add_in_stock ) {
            $meta_query[] = array(
                'key'     => '_stock_status',
                'value'   => 'instock',
                'compare' => 'IN',
            );

            if ( count ( $meta_query ) > 1 ) {
                $meta_query['relation'] = 'AND';
            }

            $filtered_query->set('meta_query', $meta_query );
        }
    }

    return $filtered_query;
}

function flrt_display_variations_in_stock_only( $separated_queries ) {

    $products_in_stock_query_exists = false;
    if ( isset( $separated_queries['for_products'] ) ) {
        foreach ( $separated_queries['for_products'] as $products_meta_query ) {
            if ( isset( $products_meta_query['key'] ) && $products_meta_query['key'] === '_stock_status' ) {
                $products_in_stock_query_exists = true;
                break;
            }
        }
    }

    $variations_in_stock_query_exists = false;
    if ( isset( $separated_queries['for_variations'] ) ) {
        foreach ( $separated_queries['for_variations'] as $products_meta_query ) {
            if ( isset( $products_meta_query['key'] ) && $products_meta_query['key'] === '_stock_status' ) {
                $variations_in_stock_query_exists = true;
                break;
            }
        }
    }

    //@todo consider to relate with WooCommerce 'woocommerce_hide_out_of_stock_items' option value
    if ( $products_in_stock_query_exists && ! $variations_in_stock_query_exists ) {
        $separated_queries['for_variations'] = array(
            array(
                'key'     => '_stock_status',
                'value'   => array( 'instock' ),
                'compare' => "IN"
            )
        );
        $separated_queries['for_products'] = array();

    }

    return $separated_queries;
}

function flrt_all_set_wp_queried_in_stock_only( $set_wp_query ){

    /**
     * Set In Stock products by default
     * For correct term count calculations
     *
    if ( $set_wp_query->get('wc_query') === 'product_query' || $set_wp_query->get('post_type') === 'product' ) {
        $meta_query   = $set_wp_query->get( 'meta_query' );
        $add_in_stock = true;

        if ( ! empty( $meta_query ) ) {
            foreach( $meta_query as $sub_query ) {
                if ( isset( $sub_query['key'] ) && $sub_query['key'] === '_stock_status' ) {
                    $add_in_stock = false;
                    break;
                }
            }
        }

        if ( $add_in_stock ) {
            $meta_query[] = array(
                'key'     => '_stock_status',
                'value'   => 'instock',
                'compare' => 'IN',
            );

            $set_wp_query->set( 'meta_query', $meta_query );
        }
    }

    return $set_wp_query;
}
 */
?>