Fix dropdown issue

Author: sillicon

src/definitions/modules/dropdown.js

@@ -2415,9 +2415,13 @@ $.fn.dropdown = function(parameters) {
           },
           direction: function($menu) {
             if(settings.direction == 'auto') {
-              // reset position
-              module.remove.upward();
-
+              // reset position, remove upward if it's base menu
+              if (!$menu) {
+                module.remove.upward();
+              } else if ($menu.hasClass('upward')) {
+                //we need make sure when make assertion openDownward for $menu, $menu does not have upward class
+                $menu.removeClass('upward');
+              }
               if(module.can.openDownward($menu)) {
                 module.remove.upward($menu);
               }