PowerPack Content Grid - Show only rendered products terms in filters

code.php

// PowerPack Content Grid - Show only rendered products terms in filters
add_action( 'pp_cg_before_posts', function( $settings, $query ) {

	if ( 'no' == $settings->post_grid_filters_display || 'none' == $settings->post_grid_filters ) {
		return;
	}
	
	add_filter( 'pp_cg_filtered_terms', function( $filtered_terms, $terms, $module_settings ) use ( $query ) {
		$rendered_terms = array();
		$posts = $query->get_posts();
		foreach ( $posts as $single ) {
			$post_terms = wp_get_object_terms( $single->ID, $module_settings->post_grid_filters, array( 'fields' => 'ids' ) );
			if ( ! is_wp_error( $post_terms ) ) {
				foreach ( $post_terms as $term ) {
					$rendered_terms[] = $term;
				}
			}
		}

		$rendered_terms = array_unique( $rendered_terms );
		
		if ( empty( $rendered_terms ) ) {
			return $filtered_terms;
		}
		
		$new_terms = array();
		
		foreach ( $filtered_terms as $term_id ) {
			if ( in_array( $term_id, $rendered_terms ) ) {
				$new_terms[] = $term_id;
			}
		}
		
		return $new_terms;
	}, 10, 3 );

}, 10, 2 );