Merge pull request #1200 from elo7/shadow-root

Fix touch event listener when element is inside a Shadow DOM

Sortable.js

@@ -526,9 +526,14 @@
 					_css(ghostEl, 'display', 'none');
 				}
 
-				var target = document.elementFromPoint(touchEvt.clientX, touchEvt.clientY),
+				var target = document.elementFromPoint(touchEvt.clientX, touchEvt.clientY);
-					parent = target,
+				var parent = target;
-					i = touchDragOverListeners.length;
+				var i = touchDragOverListeners.length;
+
+				if (target && target.shadowRoot) {
+					target = target.shadowRoot.elementFromPoint(touchEvt.clientX, touchEvt.clientY);
+					parent = target;
+				}
 
 				if (parent) {
 					do {