Subject of the issue

dragging small item over large one isn't ideal.

part of #1094

Your environment

• h5 v4.0.1 chrome

Steps to reproduce

gridstack.js/spec/e2e/html/141_1534_swap.html#

issue

right now we check for 50% mid point before swapping on the drop over area, but if you drag a small item over a much larger one, it would be nice to do the swap if EITHER is 50% covered (or maybe entire small), which would also require not only a collide node BUT also a top/bottom/left/right are to let us know where to put dragged item (for after cases)