Index: src/wp-admin/css/admin-menu.css
===================================================================
--- src/wp-admin/css/admin-menu.css	(revision 35198)
+++ src/wp-admin/css/admin-menu.css	(working copy)
@@ -197,12 +197,14 @@
 	word-wrap: break-word;
 }

-#adminmenu .wp-submenu,
-.folded #adminmenu a.wp-has-current-submenu:focus + .wp-submenu,
-.folded #adminmenu .wp-has-current-submenu .wp-submenu {
+#adminmenu .wp-submenu {
 	padding: 7px 0 8px;
 	z-index: 9999;
 	background-color: #32373c;
+}
+
+#adminmenu a.wp-has-submenu:focus + .wp-submenu,
+#adminmenu .wp-has-submenu.opensub .wp-submenu {
 	-webkit-box-shadow: 0 3px 5px rgba(0,0,0,0.2);
 	box-shadow: 0 3px 5px rgba(0,0,0,0.2);
 }
@@ -227,8 +229,6 @@
 	bottom: auto;
 	border: 0 none;
 	margin-top: 0;
-	-webkit-box-shadow: none;
-	box-shadow: none;
 	background-color: #32373c;
 }

@@ -450,7 +450,9 @@
 	margin-top: -8px;
 }

-.folded ul#adminmenu li:hover a.wp-has-current-submenu:after {
+.folded ul#adminmenu li:hover a.wp-has-current-submenu:after,
+.folded ul#adminmenu .opensub a.wp-has-current-submenu:after,
+.folded ul#adminmenu li > a.menu-top.wp-has-current-submenu:focus:after {
 	display: none;
 }

@@ -709,7 +711,9 @@
 		margin-bottom: 0;
 	}

-	.auto-fold ul#adminmenu li:hover a.wp-has-current-submenu:after {
+	.auto-fold ul#adminmenu li:hover a.wp-has-current-submenu:after,
+	.auto-fold ul#adminmenu .opensub a.wp-has-current-submenu:after,
+	.auto-fold ul#adminmenu li > a.menu-top.wp-has-current-submenu:focus:after {
 		display: none;
 	}

@@ -829,6 +833,10 @@
 		display: block;
 		top: 0;
 		left: -1px;
+	}
+
+	.auto-fold #adminmenu .wp-menu-open .wp-submenu,
+	.auto-fold #adminmenu a.wp-has-submenu:focus + .wp-submenu {
 		-webkit-box-shadow: none;
 		box-shadow: none;
 	}
Index: src/wp-admin/css/colors/_admin.scss
===================================================================
--- src/wp-admin/css/colors/_admin.scss	(revision 35198)
+++ src/wp-admin/css/colors/_admin.scss	(working copy)
@@ -146,7 +146,8 @@
 #adminmenu .wp-has-current-submenu .wp-submenu,
 #adminmenu .wp-has-current-submenu.opensub .wp-submenu,
 .folded #adminmenu .wp-has-current-submenu .wp-submenu,
-#adminmenu a.wp-has-current-submenu:focus + .wp-submenu {
+#adminmenu a.wp-has-current-submenu:focus + .wp-submenu,
+.folded #adminmenu a.wp-has-current-submenu:focus + .wp-submenu {
 	background: $menu-submenu-background;
 }