Fixed minor UX bug on closing floatWindow don't close fw button

web/desktop.system

@@ -2106,6 +2106,7 @@
 
             //Find the btn object that contains the windowID
             var closingWindowID = $(fw).attr("windowId");
+            $("#stackedWindowList").hide();
             resizeAllFloatWindowButtons();
             hideAllContextMenus();
         }