Index: wp-admin.css
===================================================================
--- wp-admin.css	(revision 9914)
+++ wp-admin.css	(working copy)
@@ -1048,6 +1048,10 @@
 	cursor: w-resize;
 }
 
+.folded #adminmenu li.wp-menu-separator {
+	cursor: e-resize;
+}
+
 #adminmenu .wp-menu-separator-last {
 	height: 10px;
 	width: 1px;