Don't swap when dropping onto the same element

Sortable.js

@@ -1039,9 +1039,12 @@
 						}
 
 						if (options.swap && lastEl)
+						{
+							if (dragEl !== lastEl)
 							{
 								_dispatchEvent(this, rootEl, 'end', dragEl, parentEl, rootEl, oldIndex, newIndex, evt, {swapItem:lastEl});
 							}
+						}
 						else
 						{
 							_dispatchEvent(this, rootEl, 'end', dragEl, parentEl, rootEl, oldIndex, newIndex, evt);