Ticket #42649: 42649.patch

src/wp-admin/css/admin-menu.css

@@ -485 +485 @@
 }
 
 #adminmenu li.wp-menu-separator {
-        height: 5px;
+        height: 0;
         padding: 0;
-        margin: 0 0 6px 0;
+        margin: 0;
         cursor: inherit;
 }