Sortable: Infinite movement loop

[vporton]

I've rather easily managed to make List B at http://rubaxa.github.io/Sortable/ into an infinite movement back and forth loop (while I held mouse button but do not move mouse) by moving the rectangle with comma.

[rndmerle]

I've the same issue when moving a small element onto a bigger one.
I've recorded it :

[owen-m1]

Solved in 1.8.0-rc1.