I noticed something very useful in Google apps.
When we have dialog with big content, divider line is showing in order to emphasize ability to scroll, like in this two pictures:
But, I have no idea how to implement such behaviour using known utils.
Best example is while choosing phone ring, at the start there is only divider on the bottom, but when we start scrolling two dividers appear.
QUESTION
How to implement appearing and disappearing behaviour in dialog?