Make item fully visible after expanding

[Savrov]

I just noticed that if i scroll to the last item and click to expand, then part of the opened view is invisible. How can i scroll down to make the whole view visible?

[cachapa]

ExpandableLayout knows nothing about the layout where it's contained, so it can't know if the expanded area is visible to the user or not.

This question comes up often enough that I'll just implement a solution in the demo.

[cachapa]

See 653253f