Fix laggy dragging

[skjiisa]

Instead of having an animation when you're dragging, have the animation only when you stop dragging.

[Jake-Short]

Thanks @isvvc , this PR looks good! Only thing that is holding me back from merging right now is that ending the drag now causes the image to kind of abruptly stop, then fade out, rather than continue to move while fading out and slowing down.

If you wanted to try and workaround this you can, if not I can try and get to it soon and merge your request.

Thanks for your contribution :)

[skjiisa]

This should fix it. I used interactive spring for returning to rest position and regular spring for the fade out, but you could change those if you prefer something else.