[frontend] Fix closest point detection on hover in the performance graph
var j = dateBisector(self.data, x, 1);
var d0 = self.data[j - 1];
var d1 = self.data[j];
- var closest = x - d0 > d1 - x ? d1 : d0;
+ var closest = x - d0[0] > d1[0] - x ? d1 : d0;
graphs.forEach(function (graph) {
graph.highlightPoint(closest)
