Customize: Ensure `dynamic_sidebar()` finishes with removing the sidebar ID from the `current_dynamic_sidebar_id_stack`.

This ensures that widgets appearing after a nested sidebar will continue to be selective refreshable.
 
See #27355.

Built from https://develop.svn.wordpress.org/trunk@36623


git-svn-id: http://core.svn.wordpress.org/trunk@36590 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-customize-widgets.php

@@ -1694,6 +1694,7 @@ final class WP_Customize_Widgets {
 	 * @param int|string $index Index, name, or ID of the dynamic sidebar.
 	 */
 	public function end_dynamic_sidebar( $index ) {
+		array_shift( $this->current_dynamic_sidebar_id_stack );
 		if ( ! $this->manager->selective_refresh->is_render_partials_request() ) {
 			printf( "\n<!--dynamic_sidebar_after:%s:%d-->\n", esc_html( $index ), intval( $this->sidebar_instance_count[ $index ] ) );
 		}

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-alpha-36622';
+$wp_version = '4.5-alpha-36623';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.