`preventCollision` is not respected for multi drag

[ManuelRauber]

Turn on preventCollision on the multi-drag example and move at least two items around. The grid will start reordering everything instead of preventing the collision like in the single item dragging.

[amanosacrous]

Hi @ManuelRauber !

The preventCollision option is not supported for multi-drag-drop currently. So it will behave the same as if it were not selected.
The current multi-drag-drop feature has been initially designed to be used with vertical/noCompact compaction and without preventCollision.

We’ll be adding the preventCollision on multi soon, since we see it’s being used :)