#680: fixed radio state

Sortable.js

@@ -86,6 +86,7 @@
 		abs = Math.abs,
 		min = Math.min,
 
+		savedInputChecked = [],
 		touchDragOverListeners = [],
 
 		_autoScroll = _throttle(function (/**Event*/evt, /**Object*/options, /**HTMLElement*/rootEl) {
@@ -214,7 +215,6 @@
 	;
 
 
-
 	/**
 	 * @class  Sortable
 	 * @param  {HTMLElement}  el
@@ -314,6 +314,9 @@
 				filter = options.filter,
 				startIndex;
 
+			_saveInputCheckedState(el);
+
+
 			// Don't trigger start event when an element is been dragged, otherwise the evt.oldindex always wrong when set option.group.
 			if (dragEl) {
 				return;
@@ -972,6 +975,11 @@
 			putSortable =
 			activeGroup =
 			Sortable.active = null;
+
+			savedInputChecked.forEach(function (el) {
+				el.checked = true;
+			});
+			savedInputChecked.length = 0;
 		},
 
 		handleEvent: function (/**Event*/evt) {
@@ -1410,6 +1418,16 @@
 			);
 	}
 
+	function _saveInputCheckedState(root) {
+		var inputs = root.getElementsByTagName('input');
+		var idx = inputs.length;
+
+		while (idx--) {
+			var el = inputs[idx];
+			el.checked && savedInputChecked.push(el);
+		}
+	}
+
 	try {
 		window.addEventListener('test', null, Object.defineProperty({}, 'passive', {
 			get: function () {