clone sparkline group with id

cell/model/Workbook.js

@@ -5696,7 +5696,7 @@ Woorksheet.prototype.updateSparklineCache = function(sheet, ranges) {
 	Woorksheet.prototype.getSparklineGroup = function(c, r) {
 		for (var i = 0; i < this.aSparklineGroups.length; ++i) {
 			if (-1 !== this.aSparklineGroups[i].contains(c, r)) {
-				return this.aSparklineGroups[i];
+				return this.aSparklineGroups[i].clone(true);
 			}
 		}
 		return null;

cell/model/WorkbookElems.js

@@ -4692,6 +4692,7 @@ CellArea.prototype = {
 	};
 	sparklineGroup.prototype.clone = function (onlyProps) {
 		var res = new sparklineGroup(!onlyProps);
+		res.Id = this.Id;
 		res.manualMax = this.manualMax;
 		res.manualMin = this.manualMin;
 		res.lineWeight = this.lineWeight;