fix(academy): show course steps in PublishPress workflow statuses

web/app/mu-plugins/cbf-learndash-workflow-statuses.php

@@ -0,0 +1,46 @@
+<?php
+/**
+ * Show course steps in PublishPress workflow statuses in course listings.
+ *
+ * LearnDash loads a course's lessons, topics and quizzes for the front end
+ * with a query limited to WordPress's built-in post statuses. Steps in a
+ * PublishPress Statuses workflow status, such as Ready or In Progress, are
+ * dropped from the course listing for everyone, even though the course
+ * builder shows them, while steps in Draft or Pending still appear.
+ *
+ * This adds the pre-publication workflow statuses to that query, so they're
+ * treated like Draft and Pending. Revision statuses are left out, because
+ * revisions are separate posts. Who can see a step is unchanged: LearnDash
+ * still drops any unpublished step the viewer can't read.
+ *
+ * @package CBF
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+add_filter(
+	'learndash_course_steps_post_status_keys',
+	static function ( $keys ) {
+		if ( ! is_array( $keys ) ) {
+			return $keys;
+		}
+
+		$statuses = get_post_stati(
+			array(
+				'internal' => false,
+				'_builtin' => false,
+			),
+			'objects'
+		);
+
+		foreach ( $statuses as $key => $status ) {
+			if ( ! empty( $status->moderation ) && empty( $status->for_revision ) ) {
+				$keys[] = $key;
+			}
+		}
+
+		return array_values( array_unique( $keys ) );
+	}
+);