Move drop logic from drag end to drop

[jameskerr]

Fixes #260

This let's us utilize the "escape" key to cancel a drag. It also cancels a drag if you drop it outside of the tree. Here's a video showing this at work.

escape-cancel.mp4

[SpencerHC]

Hey, thanks for all the work on this!

I'm now having trouble with reordering an item below the bottom item. The hit area is much smaller than it was previously and doesn't trigger my custom handleMove anymore. Is there a fix for this? Maybe with ignoreDropsOutside? Thanks again!

[yalogica]

Hey, thanks for all the work on this!

I'm now having trouble with reordering an item below the bottom item. The hit area is much smaller than it was previously and doesn't trigger my custom handleMove anymore. Is there a fix for this? Maybe with ignoreDropsOutside? Thanks again!

I have a similar problem, now I have to drop the dragged element on the tree row, if I don't and I drop outside the row but inside the tree component, then onMove doesn't call.
It's fine with [email protected], but not with versions higher than that.

[jameskerr]

Thanks for reporting. Let's get that fixed...