Resizing does not correctly scroll when the scroll container is the body #416
Description
When using the south handle to resize an element larger, scrolling does not work correctly if the scroll container is the <body> element.
To reproduce: Navigate to the demo and inspect the page. Remove the overflow and height: 100% (where applicable) from <html>, <body>, <demo-root> and div.main-content. Try to resize an element down past the edge of the window.