_positionChanged(active, e) {
    const {caretX, caretY, options} = this;
    const position = positioners[options.position].call(this, active, e);
    return position !== false && (caretX !== position.x || caretY !== position.y);
  }
Determine if the active elements + event combination changes the
tooltip position
@param {array} active - Active elements
@param {ChartEvent} e - Event that triggered the position change
@returns {boolean} True if the position has changed