Comment 1 for bug 1498138

1) Indeed, we should set the z-order to be MAXINT while dragged so they go over any element in the view.
2) you don't see the z-order going back to 1 as the dragged item is duplicated, the original one is hidden for the entire time of dragging and the duplicate is set to be z-ordered 2. This duplicate is then deleted when dropped event animations are completed.

So the only bug we have is the z-order of the dragged element.