Editor: fix the replacement of `wp.editor` with `wp.oldEditor` in the inline script outputted when enqueueing the old editor.

Props fullofcaffeine, davidbinda, grantmkin, get_dave, azaozz.
Fixes #53762.
Built from https://develop.svn.wordpress.org/trunk@51748


git-svn-id: http://core.svn.wordpress.org/trunk@51356 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-editor.php

@@ -969,8 +969,12 @@ final class _WP_Editors {
 		?>
 		<script type="text/javascript">
 		window.wp = window.wp || {};
-		window.wp.editor = window.wp.oldEditor = window.wp.oldEditor || {};
-		window.wp.oldEditor.getDefaultSettings = function() {
+		window.wp.editor = window.wp.editor || {};
+		window.wp.oldEditor = window.wp.oldEditor || {};
+
+		// Add getDefaultSettings() to both wp.editor and wp.oldEditor for back compat.
+		// Use of wp.editor for "old editor" functionality should be deprecated.
+		window.wp.editor.getDefaultSettings = window.wp.oldEditor.getDefaultSettings = function() {
 			return {
 				tinymce: <?php echo $settings; ?>,
 				quicktags: {

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-51740';
+$wp_version = '5.9-alpha-51748';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.