csv data - series names are random when seriesMapping object property has value more than 10.

[wchmiel]

Expected behaviour

appropriate series names when data loaded from csv file and seriesMapping property value is more than 10.

Actual behaviour

series names are get from csv file randomly (first row of csv file).

Live demo with steps to reproduce

https://jsfiddle.net/wchmiel/64bcp0Lq/

1. set var in seriesMapping more than 10 and run example
2. check particular series name - it should't be correct
3. set var in seriesMapping less than 10 and run example
4. check particular series name - it should be correct

Product version

Highcharts

Affected browser(s)

all

[pawelfus]

Internal note:
Issue comes from these lines:

highcharts/js/modules/data.src.js

Lines 2070 to 2079 in e9082f1

	if (columnIndexes.length >= 2) {
	// remove the first one (x col)
	columnIndexes.shift();
	// Sort the remaining
	columnIndexes.sort();
	// Now use the lowest index as name column
	this.name = columns[columnIndexes.shift()].name;
	}

Where [5, 10].sort() results as [10, 5] (string sorting conversion).

[pawelfus]

Internal note:
Issue comes from these lines:

highcharts/js/modules/data.src.js

Lines 2070 to 2079 in e9082f1

	if (columnIndexes.length >= 2) {
	// remove the first one (x col)
	columnIndexes.shift();
	// Sort the remaining
	columnIndexes.sort();
	// Now use the lowest index as name column
	this.name = columns[columnIndexes.shift()].name;
	}

Where [5, 10].sort() results as [10, 5] (string sorting conversion).