_homeEndForSelectedRange(e, affectedValue, min, max) {
      const newValueOffset = this._handleActionKeyPressBase(e, affectedValue);
      const ctor = this.constructor;
      const newStartValue = ctor.clipValue(newValueOffset + this.startValue, min, max);
      const newEndValue = ctor.clipValue(newValueOffset + this.endValue, min, max);
      this.update(undefined, newStartValue, newEndValue);
    }
Calculates the start and end values when the 'Home" or 'End' keys
are pressed on the selected range bar.

@private