Walker::$has_children should be public for backward compatibility.

See [31137]. See #30891.

git-svn-id: https://develop.svn.wordpress.org/trunk@31141 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-walker.php

@@ -43,10 +43,9 @@ class Walker {
 	 * To be used in start_el().
 	 *
 	 * @since 4.0.0
-	 * @access protected
 	 * @var bool
 	 */
-	protected $has_children;
+	public $has_children;
 
 	/**
 	 * Starts the list before the elements are added.