In `comment_form()`, ensure that filtered arguments contain all required default values.

props boonebgorges.
fixes #32312 for trunk.
Built from https://develop.svn.wordpress.org/trunk@32511


git-svn-id: http://core.svn.wordpress.org/trunk@32481 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/comment-template.php

@@ -2252,6 +2252,9 @@ function comment_form( $args = array(), $post_id = null ) {
 	 */
 	$args = wp_parse_args( $args, apply_filters( 'comment_form_defaults', $defaults ) );
 
+	// Ensure that the filtered args contain all required default values.
+	$args = array_merge( $defaults, $args );
+
 		if ( comments_open( $post_id ) ) : ?>
 			<?php
 			/**

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.3-alpha-32510';
+$wp_version = '4.3-alpha-32511';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.