diff -r be944660c56a -r 3d72ae0968f4 wp/wp-includes/revision.php
--- a/wp/wp-includes/revision.php	Wed Sep 21 18:19:35 2022 +0200
+++ b/wp/wp-includes/revision.php	Tue Sep 27 16:37:53 2022 +0200
@@ -447,7 +447,7 @@
  * @since 2.6.0
  *
  * @param int|WP_Post $revision_id Revision ID or revision object.
- * @return array|false|WP_Post|WP_Error|null Null or WP_Error if error, deleted post if success.
+ * @return WP_Post|false|null Null or false if error, deleted post object if success.
  */
 function wp_delete_post_revision( $revision_id ) {
 	$revision = wp_get_post_revision( $revision_id );
@@ -517,6 +517,40 @@
 }
 
 /**
+ * Returns the url for viewing and potentially restoring revisions of a given post.
+ *
+ * @since 5.9.0
+ *
+ * @param int|WP_Post $post_id Optional. Post ID or WP_Post object. Default is global `$post`.
+ * @return null|string The URL for editing revisions on the given post, otherwise null.
+ */
+function wp_get_post_revisions_url( $post_id = 0 ) {
+	$post = get_post( $post_id );
+
+	if ( ! $post instanceof WP_Post ) {
+		return null;
+	}
+
+	// If the post is a revision, return early.
+	if ( 'revision' === $post->post_type ) {
+		return get_edit_post_link( $post );
+	}
+
+	if ( ! wp_revisions_enabled( $post ) ) {
+		return null;
+	}
+
+	$revisions = wp_get_post_revisions( $post->ID, array( 'posts_per_page' => 1 ) );
+
+	if ( 0 === count( $revisions ) ) {
+		return null;
+	}
+
+	$revision = reset( $revisions );
+	return get_edit_post_link( $revision );
+}
+
+/**
  * Determine if revisions are enabled for a given post.
  *
  * @since 3.6.0
@@ -574,6 +608,11 @@
 	 * The dynamic portion of the hook name, `$post->post_type`, refers to
 	 * the post type slug.
 	 *
+	 * Possible hook names include:
+	 *
+	 *  - `wp_post_revisions_to_keep`
+	 *  - `wp_page_revisions_to_keep`
+	 *
 	 * @since 5.8.0
 	 *
 	 * @param int     $num  Number of revisions to store.
@@ -599,15 +638,14 @@
 	}
 
 	$preview = wp_get_post_autosave( $post->ID );
-	if ( ! is_object( $preview ) ) {
-		return $post;
-	}
+
+	if ( is_object( $preview ) ) {
+		$preview = sanitize_post( $preview );
 
-	$preview = sanitize_post( $preview );
-
-	$post->post_content = $preview->post_content;
-	$post->post_title   = $preview->post_title;
-	$post->post_excerpt = $preview->post_excerpt;
+		$post->post_content = $preview->post_content;
+		$post->post_title   = $preview->post_title;
+		$post->post_excerpt = $preview->post_excerpt;
+	}
 
 	add_filter( 'get_the_terms', '_wp_preview_terms_filter', 10, 3 );
 	add_filter( 'get_post_metadata', '_wp_preview_post_thumbnail_filter', 10, 3 );