Fixed fallback not working if elements were in ShadowRoot #1282
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The fallback of Drag N Drop behaviour works on elements in Shadow DOM but only if there's only one ShadowRoot. Sadly, this is not always the case.
My modifications make it work no matter how many ShadowRoots are in the tree.
Here is a comparison:
My fork
Current master
This issue was reported on polymer-sortablejs#25 because usually Polymer uses many ShadowRoots.