Make the infinite scroll work even when the content size is less than the layout measurement

[prateek3255]

The infinite scroll doesn't work when the content is less than the screen size, i.e. when the scroll bar doesn't appear. So make it work even when the content is less than or equal to the screen size. The implementation of this effect is pretty basic, you can just take a look at the code to understand how it works. Ping me if you need any help in understanding.