Tooltip failing for multiple datasets

When using the C3 on your website (/js/c3.min-3cd9714d.js) if I paste the code below into the standard multiple line chart (http://c3js.org/samples/simple_xy_multiple.html) I get the correct graph.

However, when I zoom in quite a bit, and I try to hover over each point. If I am on the exact time point it shows up, as soon as I leave even a few pixels it goes away. xSort doesn't seem to help for me.

Any ideas? Thanks.

```
var t1, t2, t3, t4 = 0;
var chart = c3.generate({
data: {
columns: [
['data1', 30, 200, 100, 400, 150, 250],
['data2', 50, 20, 10, 40, 15, 25]
],
selection: { enabled: true }
},

subchart: {
show: true
},
onrendered:function(){
console.log("Hello")
}
});

setTimeout(function () {
t1 = (new Date).getTime();
console.log("Data1: ", t1);
chart.load({
columns: [
['data1', 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 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250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 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250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450]
],
done: function() {
t2 = (new Date).getTime();
console.log("Data1: ", t2);
console.log("TIME1: ", (t2 - t1));
}
});
}, 1000);

setTimeout(function () {
t3 = (new Date).getTime();
console.log("Data2: ", t3);
chart.load({
columns: [
['data2', 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 300, 500, 300, 400, 100, 350, 250, 450, 230, 190, 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300, 500 ]
],
done: function() {
t4 = (new Date).getTime();
console.log("Data2: ", t4);
console.log("TIME2: ", (t4 - t3));
}
});
}, 5000);
```

Reproduce the issue in /js/c3.min-3cd9714d.js using the simple_xy_multiple.html sample and the provided chart configuration. Start by observing tooltip behavior after zooming and moving the pointer slightly away from a point; done means tooltips remain usable around points in the multiple-dataset chart.

Written by the indexing model from the issue text.