Add measurements regarding list rerender.
Get rid of another v4 compat class.

Now that we no longer support v4, we don't need it anymore.
Get rid of our custom FastScroller workaround, too.

I have to believe that this has no been fixed in Android proper. Certainly,
the FastScroller has been rewritten, and this is liable to cause problems
at some point.
Enable Python framework in IDEA.
Revert "Get rid of our custom FastScroller workaround, too."

Turns out, the bug still exists!

This reverts commit dacd6b4c8ca9de8a771a514e67f564e05033eeb7.