Ticket #30369: 30369.2.patch

src/wp-admin/includes/class-wp-upgrader.php

@@ -1370 +1370 @@
                 remove_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );
 
                 if ( $parsed_args['clear_update_cache'] ) {
-                        wp_clean_themes_cache( true );
-                        wp_clean_plugins_cache( true );
-                        delete_site_transient( 'update_core' );
+                        _clear_update_transients();
                 }
 
                 return $results;
@@ -2200 +2198 @@
                         }
 
                         // Clear existing caches
-                        wp_clean_plugins_cache();
-                        wp_clean_themes_cache();
-                        delete_site_transient( 'update_core' );
+                        _clear_update_transients();
 
                         wp_version_check();  // check for Core updates
                         wp_update_themes();  // Check for Theme updates

src/wp-includes/update.php

@@ -648 +648 @@
         }
 }
 
+/**
+ * Clear existing update caches for plugins, themes, and core.
+ *
+ * @since 4.1.0
+ */
+function _clear_update_transients() {
+        wp_clean_plugins_cache();
+        wp_clean_themes_cache();
+        delete_site_transient( 'update_core' );
+}
+
 if ( ( ! is_main_site() && ! is_network_admin() ) || ( defined( 'DOING_AJAX' ) && DOING_AJAX ) )
         return;
 
@@ -669 +680 @@
 add_action( 'wp_update_themes', 'wp_update_themes' );
 add_action( 'upgrader_process_complete', 'wp_update_themes', 10, 0 );
 
+add_action( 'update_option_WPLANG', '_clear_update_transients' , 10, 0 );
+
 add_action( 'wp_maybe_auto_update', 'wp_maybe_auto_update' );
 
 add_action('init', 'wp_schedule_update_checks');