X-range: Tooltip loses default data formatting

[madepiet]

Expected behaviour

After adding API-compliant properties like name the tooltip should not lose its default datatime formatting.

Actual behaviour

As you can see in the demo below, for data with a name set, the tooltip does not recognize datatime formatting, and for data without name, it formats the data correctly. It would be necessary to standardize this behavior also for the axis standard data type in the X-range series.

Live demo with steps to reproduce

https://jsfiddle.net/BlackLabel/ohxp34qt/

Product version

7.0.0

[karolkolodziej]

Internal note:
It happens because the key is replaced by the point name. Not saying that the fix should be here, probably not ;)

highcharts/ts/Core/Series/Point.ts

Lines 611 to 632 in 7b7bc11

	/**
	* Return the configuration hash needed for the data label and tooltip
	* formatters.
	*
	* @function Highcharts.Point#getLabelConfig
	*
	* @return {Highcharts.PointLabelObject}
	* Abstract object used in formatters and formats.
	*/
	public getLabelConfig(): Point.PointLabelObject {
	return {
	x: this.category,
	y: this.y,
	color: this.color,
	colorIndex: this.colorIndex,
	key: this.name || this.category,
	series: this.series,
	point: this as any,
	percentage: this.percentage,
	total: this.total || (this as any).stackTotal
	};
	}

As a workaround, you can use a custom formatter.