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Y-Axis has wrong range in StackedBarChart

See original GitHub issue

What is the problem?

I can’t display an X-Axis with correct values for a horizontal StackedBarChart.

What platform?

iOS React Native version: 0.55

Code to reproduce

     let colors = [ '#7b4173', '#a55194'];

      let data = [
        {
          label: 'One',
          apples: 5,
          oranges: 6
        },
        {
          label: 'Two',
          apples: 10,
          oranges: 20
        }
      ];
      let keys = ['apples', 'oranges'];

      return (
        <View style={{ height: 220 }}>
          <View style={{ height: 200, flexDirection: 'row' }}>
            <YAxis
                data={ data }
                contentInset={ { top: 30, bottom: 30 } }
                yAccessor={({ index }) => index}
                formatLabel={ (value, index) => {return data[index].label} }
                svg={{ fontSize: 10, fill: 'grey' }}
                numberOfTicks={ 1 }
                scale={scale.scaleBand}
            />
            <StackedBarChart
                style={{ flex: 1, marginLeft: 16}}
                keys={ keys }
                colors={ colors }
                data={ data }
                horizontal={ true }
                contentInset={ { top: 15, bottom: 15 } }
            />
          </View>
          <XAxis
              data={ StackedBarChart.extractDataPoints(data, keys) }
              contentInset={ { left: 20, right: 15 } }
              // formatLabel={ (value, index) => this._chartData[index].label }
              svg={{ fontSize: 6, fill: 'grey' }}
              scale={scale.scaleBand}
          />
        </View>)

I would expect the X-Axis to go from 0 to 30, but instead it is from 0 to 7: screenshot 2018-06-13 12 51 25