In the case of automatic scroll requirements (ie. scroll to selected) we
are delegating the animation logic to the panels themselves. In order to
make this work correctly, the scroll operation needs to take effect
before any animation updates are run.
This was causing multiple issues with masking and sizing and really
didn't need to exist in the first place. Also not sure why the pool was
nested inside the scroll container, but it isn't any more. Probably for
the best.