Animate selection when pagination occurs

[1j01]

It'd be cool if when playing and selecting audio at the same time, when it paginates, if it did a little animation of the end of the selection that you're dragging from where it was, spatially, to where you're dragging,
so that there's not a jarring recontextualization of spacial... whateverything

from where your mouse was considered to be to where it's now considered to be
to avoid a jarring spacial recontextualization

it obviously shouldn't take longer to reach your mouse if you move your mouse away from it
and it should probably jump to your mouse if you release

(Note: see the README for many more important features/TODOs; I should move more of them to issues maybe, but anyways for now I'm just writing this particular issue here because it's easier)