Editor: Additional tests for reusable blocks.

Ensure that subsequent renders of a reusable block will render correctly and that recursively inserting a reusable block into itself does not cause an internal server (500) error.

Props bernhard-reiter, SergeyBiryukov.
Fixes #52364.


Built from https://develop.svn.wordpress.org/trunk@50382


git-svn-id: http://core.svn.wordpress.org/trunk@49993 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.7-beta3-50381';
+$wp_version = '5.7-beta3-50382';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.