Index: src/wp-includes/css/media-views.css
===================================================================
--- src/wp-includes/css/media-views.css	(revision 30739)
+++ src/wp-includes/css/media-views.css	(working copy)
@@ -649,6 +649,7 @@
 
 .media-frame.hide-menu .media-frame-menu {
 	left: -200px;
+	display: none;
 }
 
 .media-frame.hide-toolbar .media-frame-content {