diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-includes/ms-default-filters.php
--- a/wp/wp-includes/ms-default-filters.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-includes/ms-default-filters.php	Tue Dec 15 13:49:49 2020 +0100
@@ -15,12 +15,12 @@
 
 add_action( 'init', 'ms_subdomain_constants' );
 
-// Functions
+// Functions.
 add_action( 'update_option_blog_public', 'update_blog_public', 10, 2 );
 add_filter( 'option_users_can_register', 'users_can_register_signup_filter' );
 add_filter( 'site_option_welcome_user_email', 'welcome_user_msg_filter' );
 
-// Users
+// Users.
 add_filter( 'wpmu_validate_user_signup', 'signup_nonce_check' );
 add_action( 'init', 'maybe_add_existing_user_to_blog' );
 add_action( 'wpmu_new_user', 'newuser_notify_siteadmin' );
@@ -31,11 +31,12 @@
 add_action( 'network_site_users_created_user', 'wp_send_new_user_notifications' );
 add_action( 'network_user_new_created_user', 'wp_send_new_user_notifications' );
 add_filter( 'sanitize_user', 'strtolower' );
+add_action( 'deleted_user', 'wp_delete_signup_on_user_delete', 10, 3 );
 
-// Roles
+// Roles.
 add_action( 'switch_blog', 'wp_switch_roles_and_user', 1, 2 );
 
-// Blogs
+// Blogs.
 add_filter( 'wpmu_validate_blog_signup', 'signup_nonce_check' );
 add_action( 'wpmu_activate_blog', 'wpmu_welcome_notification', 10, 5 );
 add_action( 'after_signup_site', 'wpmu_signup_blog_notification', 10, 7 );
@@ -53,7 +54,7 @@
 add_action( 'wp_uninitialize_site', 'wp_uninitialize_site', 10, 1 );
 add_action( 'update_blog_public', 'wp_update_blog_public_option_on_site_update', 1, 2 );
 
-// Site meta
+// Site meta.
 add_action( 'added_blog_meta', 'wp_cache_set_sites_last_changed' );
 add_action( 'updated_blog_meta', 'wp_cache_set_sites_last_changed' );
 add_action( 'deleted_blog_meta', 'wp_cache_set_sites_last_changed' );
@@ -66,21 +67,21 @@
 add_filter( 'delete_blog_metadata_by_mid', 'wp_check_site_meta_support_prefilter' );
 add_filter( 'update_blog_metadata_cache', 'wp_check_site_meta_support_prefilter' );
 
-// Register Nonce
+// Register nonce.
 add_action( 'signup_hidden_fields', 'signup_nonce_fields' );
 
-// Template
+// Template.
 add_action( 'template_redirect', 'maybe_redirect_404' );
 add_filter( 'allowed_redirect_hosts', 'redirect_this_site' );
 
-// Administration
+// Administration.
 add_filter( 'term_id_filter', 'global_terms', 10, 2 );
 add_action( 'delete_post', '_update_posts_count_on_delete' );
 add_action( 'delete_post', '_update_blog_date_on_post_delete' );
 add_action( 'transition_post_status', '_update_blog_date_on_post_publish', 10, 3 );
 add_action( 'transition_post_status', '_update_posts_count_on_transition_post_status', 10, 3 );
 
-// Counts
+// Counts.
 add_action( 'admin_init', 'wp_schedule_update_network_counts' );
 add_action( 'update_network_counts', 'wp_update_network_counts', 10, 0 );
 foreach ( array( 'user_register', 'deleted_user', 'wpmu_new_user', 'make_spam_user', 'make_ham_user' ) as $action ) {
@@ -91,27 +92,27 @@
 }
 unset( $action );
 
-// Files
+// Files.
 add_filter( 'wp_upload_bits', 'upload_is_file_too_big' );
 add_filter( 'import_upload_size_limit', 'fix_import_form_size' );
 add_filter( 'upload_mimes', 'check_upload_mimes' );
 add_filter( 'upload_size_limit', 'upload_size_limit_filter' );
 add_action( 'upload_ui_over_quota', 'multisite_over_quota_message' );
 
-// Mail
+// Mail.
 add_action( 'phpmailer_init', 'fix_phpmailer_messageid' );
 
-// Disable somethings by default for multisite
+// Disable somethings by default for multisite.
 add_filter( 'enable_update_services_configuration', '__return_false' );
-if ( ! defined( 'POST_BY_EMAIL' ) || ! POST_BY_EMAIL ) { // back compat constant.
+if ( ! defined( 'POST_BY_EMAIL' ) || ! POST_BY_EMAIL ) { // Back compat constant.
 	add_filter( 'enable_post_by_email_configuration', '__return_false' );
 }
-if ( ! defined( 'EDIT_ANY_USER' ) || ! EDIT_ANY_USER ) { // back compat constant.
+if ( ! defined( 'EDIT_ANY_USER' ) || ! EDIT_ANY_USER ) { // Back compat constant.
 	add_filter( 'enable_edit_any_user_configuration', '__return_false' );
 }
 add_filter( 'force_filtered_html_on_import', '__return_true' );
 
-// WP_HOME and WP_SITEURL should not have any effect in MS
+// WP_HOME and WP_SITEURL should not have any effect in MS.
 remove_filter( 'option_siteurl', '_config_wp_siteurl' );
 remove_filter( 'option_home', '_config_wp_home' );
 
@@ -124,5 +125,5 @@
 // If the network upgrade hasn't run yet, assume ms-files.php rewriting is used.
 add_filter( 'default_site_option_ms_files_rewriting', '__return_true' );
 
-// Whitelist multisite domains for HTTP requests
+// Allow multisite domains for HTTP requests.
 add_filter( 'http_request_host_is_external', 'ms_allowed_http_request_hosts', 20, 2 );