Add `'widget_nav_menu_args'` filter for Custom Menu widget arguments.

props cyman, DrewAPicture.
fixes #29463.
Built from https://develop.svn.wordpress.org/trunk@31325


git-svn-id: http://core.svn.wordpress.org/trunk@31306 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/default-widgets.php

@@ -1344,7 +1344,26 @@ class WP_Widget_Tag_Cloud extends WP_Widget {
 		if ( !empty($instance['title']) )
 			echo $args['before_title'] . $instance['title'] . $args['after_title'];
 
-		wp_nav_menu( array( 'fallback_cb' => '', 'menu' => $nav_menu ) );
+		$nav_menu_args = array(
+			'fallback_cb' => '',
+			'menu'        => $nav_menu
+		);
+
+		/**
+		 * Filter the arguments for the Custom Menu widget.
+		 *
+		 * @since 4.2.0
+		 *
+		 * @param array    $nav_menu_args {
+		 *     An array of arguments passed to wp_nav_menu() to retrieve a custom menu.
+		 *
+		 *     @type callback|bool $fallback_cb Callback to fire if the menu doesn't exist. Default empty.
+		 *     @type mixed         $menu        Menu ID, slug, or name.
+		 * }
+		 * @param stdClass $nav_menu      Nav menu object for the current menu.
+		 * @param array    $args          Display arguments for the current widget.
+		 */
+		wp_nav_menu( apply_filters( 'widget_nav_menu_args', $nav_menu_args, $nav_menu, $args ) );
 
 		echo $args['after_widget'];
 	}

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31324';
+$wp_version = '4.2-alpha-31325';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.