iOS charts will not draw multiple datasets when the sets use different ranges of X-coordinates

When creating a line chart from **more than one data set**, the line chart only shows one of the data sets and when zooming or panning the chart it crashes with _Fatal error: Can't form Range with upperBound < lowerBound_.

If I create the line chart from one data set it works as expected.

This problem only occurs when the two datasets have completely different ranges of X values.

The code below should draw a chart with x ranging from 0 to 19. But it only draws the second dataset. The chart crashes if you pan or zoom it.

If I edit the code, replacing **for x in (10..<20)** with **for x in (0..<10)**, both datasets are correctly drawn and the chart does not crash.

To summarise: when adding two dataSets that have entries with different ranges of X coordinates the chart draws incorrectly and will crash.

Is there an iOS_charts API call needed to prevent this? How can I draw two datasets that do not have overlapping X-coordinates?

I've been able to produce the same crash when running code using [this demo code](https://github.com/danielgindi/Charts/blob/master/ChartsDemo-iOS/Swift/Demos/MultipleLinesChartViewController.swift) if I modify it to create multiple datasets that have non-overlapping x-coordinates.

```
class ElevationChartViewController: UIViewController {

@IBOutlet var chartView: LineChartView!

override func viewDidLoad() {
super.viewDidLoad()

chartView.backgroundColor = .white
chartView.legend.enabled = false
chartView.maxVisibleCount = 20000
}

override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)

let dataSets = createChartDataSets()
chartView.data = LineChartData(dataSets: dataSets)
}
}

func createChartDataSets() -> [LineChartDataSet] {
var dataSets = [LineChartDataSet]()
var entriesOne = [ChartDataEntry]()
var entriesTwo = [ChartDataEntry]()
var y = 0.0
for x in (0..<10) {
entriesOne.append( ChartDataEntry(x: Double(x), y: y))
y = y + 10
if y > 60 {y = 0.0}
}
dataSets.append(LineChartDataSet(entriesOne))

for x in (10..<20) {
entriesTwo.append( ChartDataEntry(x: Double(x), y: y))
y = y + 10
if y > 50 {y = 0.0}
}
dataSets.append(LineChartDataSet(entriesTwo))

return dataSets
}
```
Swift version: 5.4
Xcode 12.4
Observed running on a real iPhone 12 sw version 14.4
Charts v4.0.1