Video descriptions can be very long. Some of them are
basically walls of text with couple of lines at top or bottom.
They are also not scrolled within TextView itself, - instead
NewPipe expects user to scroll their containing ViewGroup.
This renders all builtin MovementMethod implementations useless.
This commit adds a new MovementMethod, that uses requestRectangleOnScreen
to intelligently re-position the TextView within it's scrollable container.