in src/columnChart/baseColumnChart.ts [1147:1172]
private static getStackedLabelColor(
isNegative: boolean,
seriesIndex: number,
seriesCount: number,
categoryIndex: number,
rawValues: number[][]): boolean {
let lastValue: boolean = !(isNegative
&& seriesIndex === seriesCount - 1
&& seriesCount !== 1);
// run for the next series and check if current series is last
for (let i: number = seriesIndex + 1; i < seriesCount; i++) {
const nextValues: number = AxisHelper.normalizeNonFiniteNumber(rawValues[i][categoryIndex]);
if ((nextValues !== null)
&& (((!isNegative || (isNegative && seriesIndex === 0)) && nextValues > 0)
|| (isNegative && seriesIndex !== 0))) {
lastValue = false;
break;
}
}
return lastValue;
}