Item nesting on first drag

[rhwilr]

Dragging items horizontally between listes should reset the threshold when entering the list. Otherwise the item will be nested automatically when dragging to a list on the right.

Reported by @nagbg in #24 :

If you first do a drag in the left list under "draggle across different lists" and then do a drag under the right list the item will directly nest under the previous item.

[stale]

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