The line charts have started to properly display balloon markers in c…

…ase several sequential data sets are presented on the same chart (two data sets are sequential if the last element of the 1st set is also the first element of the 2nd one e.g. [1,2,3] and [3,4,5]).

Charts/Classes/Charts/BarLineChartViewBase.swift

@@ -1314,10 +1314,9 @@ public class BarLineChartViewBase: ChartViewBase, UIGestureRecognizerDelegate
     {
         var vals = [ChartSelectionDetail]();
 
-        var pt = CGPoint();
-
         for (var i = 0, count = _data.dataSetCount; i < count; i++)
         {
+            var pt = CGPoint();
             var dataSet = _data.getDataSetByIndex(i);
             if (dataSet === nil || !dataSet.isHighlightEnabled)
             {