From a9f3598b8acd4376f192f8aa7034595d590e3b2e Mon Sep 17 00:00:00 2001
From: Curtis Loisel <curtis@voceconnect.com>
Date: Wed, 8 Mar 2017 17:08:19 -0500
Subject: [PATCH 1/4] Adding filter on submenu classes

---
 src/wp-includes/class-walker-nav-menu.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/wp-includes/class-walker-nav-menu.php b/src/wp-includes/class-walker-nav-menu.php
index 4c1a1f2c9..6b6951109 100644
--- a/src/wp-includes/class-walker-nav-menu.php
+++ b/src/wp-includes/class-walker-nav-menu.php
@@ -58,7 +58,12 @@ public function start_lvl( &$output, $depth = 0, $args = array() ) {
 			$n = "\n";
 		}
 		$indent = str_repeat( $t, $depth );
-		$output .= "{$n}{$indent}<ul class=\"sub-menu\">{$n}";
+
+		$classes = array( 'sub-menu' );
+		$class_names = join( ' ', apply_filters( 'nav_submenu_css_class', array_filter( $classes ), $args, $depth ) );
+		$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
+
+		$output .= "{$n}{$indent}<ul" . $class_names . ">{$n}";
 	}
 
 	/**

From 649e796a1a7877b37822f618bbecb0be662056f9 Mon Sep 17 00:00:00 2001
From: Curtis Loisel <curtis@voceconnect.com>
Date: Wed, 8 Mar 2017 17:11:57 -0500
Subject: [PATCH 2/4] Adding docblock

---
 src/wp-includes/class-walker-nav-menu.php | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/wp-includes/class-walker-nav-menu.php b/src/wp-includes/class-walker-nav-menu.php
index 6b6951109..abf14d3d6 100644
--- a/src/wp-includes/class-walker-nav-menu.php
+++ b/src/wp-includes/class-walker-nav-menu.php
@@ -57,9 +57,18 @@ public function start_lvl( &$output, $depth = 0, $args = array() ) {
 			$t = "\t";
 			$n = "\n";
 		}
-		$indent = str_repeat( $t, $depth );
-
+		$indent  = str_repeat( $t, $depth );
 		$classes = array( 'sub-menu' );
+
+		/**
+		 * Filters the CSS class(es) applied to a submenu container element.
+		 *
+		 * @since 4.7.4
+		 *
+		 * @param array    $classes The CSS classes that are applied to the submenu item's `<ul>` element.
+		 * @param stdClass $args    An object of wp_nav_menu() arguments.
+		 * @param int      $depth   Depth of menu item. Used for padding.
+		 */
 		$class_names = join( ' ', apply_filters( 'nav_submenu_css_class', array_filter( $classes ), $args, $depth ) );
 		$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
 

From b04396c6c088202e8a31931c8de0124d68f260e8 Mon Sep 17 00:00:00 2001
From: Curtis Loisel <curtis@voceconnect.com>
Date: Wed, 8 Mar 2017 17:18:59 -0500
Subject: [PATCH 3/4] Changing @since version

---
 src/wp-includes/class-walker-nav-menu.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/wp-includes/class-walker-nav-menu.php b/src/wp-includes/class-walker-nav-menu.php
index abf14d3d6..1d20f7c41 100644
--- a/src/wp-includes/class-walker-nav-menu.php
+++ b/src/wp-includes/class-walker-nav-menu.php
@@ -63,7 +63,7 @@ public function start_lvl( &$output, $depth = 0, $args = array() ) {
 		/**
 		 * Filters the CSS class(es) applied to a submenu container element.
 		 *
-		 * @since 4.7.4
+		 * @since 4.8.0
 		 *
 		 * @param array    $classes The CSS classes that are applied to the submenu item's `<ul>` element.
 		 * @param stdClass $args    An object of wp_nav_menu() arguments.

From 2dcc725d189480d5cc1189132f6873c7f1f07dec Mon Sep 17 00:00:00 2001
From: Curtis Loisel <curtis@voceconnect.com>
Date: Wed, 8 Mar 2017 17:23:48 -0500
Subject: [PATCH 4/4] Changing filter name

---
 src/wp-includes/class-walker-nav-menu.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/wp-includes/class-walker-nav-menu.php b/src/wp-includes/class-walker-nav-menu.php
index 1d20f7c41..c1ff73d84 100644
--- a/src/wp-includes/class-walker-nav-menu.php
+++ b/src/wp-includes/class-walker-nav-menu.php
@@ -69,7 +69,7 @@ public function start_lvl( &$output, $depth = 0, $args = array() ) {
 		 * @param stdClass $args    An object of wp_nav_menu() arguments.
 		 * @param int      $depth   Depth of menu item. Used for padding.
 		 */
-		$class_names = join( ' ', apply_filters( 'nav_submenu_css_class', array_filter( $classes ), $args, $depth ) );
+		$class_names = join( ' ', apply_filters( 'nav_menu_submenu_css_class', array_filter( $classes ), $args, $depth ) );
 		$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
 
 		$output .= "{$n}{$indent}<ul" . $class_names . ">{$n}";