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<?php
/** prevents woocommerce's redirect single research result during an facetwp ajax request and
 ** when facet variables are pre-loaded in the url
 **/
add_action( 'template_redirect', function() {
    if ( function_exists( 'FWP' ) && ( FWP()->ajax->is_refresh || FWP()->facet->is_preload ) ) {
		  add_filter( 'woocommerce_redirect_single_search_result', '__return_false' );
	  }    
}, 5 );