Upgrade/Install: Remove bundled theme files from $_old_files.

Because themes are updated independently of Core updates, any deleted files from bundled themes should not be included in the `$_old_files` list.

Any file included in this list is deleted on update, which could cause problems for sites with a given theme active if the removed files were required in earlier versions of that theme and that theme is not updated at the same time.

Props desrosj, costdev, SergeyBiryukov.
Fixes #56936.

git-svn-id: https://develop.svn.wordpress.org/trunk@54849 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj

src/wp-admin/includes/update-core.php

@@ -10,6 +10,8 @@
 /**
  * Stores files to be deleted.
  *
+ * Bundled theme files should not be included in this list.
+ *
  * @since 2.7.0
  *
  * @global array $_old_files
@@ -843,11 +845,7 @@
 	'wp-includes/blocks/tag-cloud/editor.min.css',
 	'wp-includes/blocks/tag-cloud/editor-rtl.css',
 	'wp-includes/blocks/tag-cloud/editor-rtl.min.css',
-	// 6.0
-	'wp-content/themes/twentytwentytwo/assets/fonts/LICENSE.md',
 	// 6.1
-	'wp-content/themes/twentytwentyone/assets/sass/05-blocks/spacer/_style.scss',
-	'wp-content/themes/twentytwentyone/assets/sass/05-blocks/spacer',
 	'wp-includes/blocks/post-comments.php',
 	'wp-includes/blocks/post-comments/block.json',
 	'wp-includes/blocks/post-comments/editor.css',