Merge pull request #2094 from vanboom/master

Issue #2093 remove ID from the cloned element prior to adding to the …

Author: owen-m1

src/Sortable.js

@@ -924,7 +924,7 @@ Sortable.prototype = /** @lends Sortable.prototype */ {
 		pluginEvent('setupClone', this);
 		if (!Sortable.eventCanceled) {
 			cloneEl = clone(dragEl);
-
+			cloneEl.removeAttribute("id");
 			cloneEl.draggable = false;
 			cloneEl.style['will-change'] = '';