JQMIGRATE: jQuery.isWindow() is deprecated

The jQuery.isWindow() method returns true if its argument is thought to be a window element. It was created for internal use and is not a reliable way of detecting window for public needs.

To eliminate this warning, remove any use of jQuery.isWindow() from code. If it is truly needed it can be replaced with a check for obj != null && obj === obj.window which was the test used inside this method.

This method was deprecated as of jQuery 3.3.0.