code: function calculateLineHeight(model, columnWidths) {
          var padding = this.internal.__cell__.padding;
          var fontSize = this.internal.__cell__.table_font_size;
          var scaleFactor = this.internal.scaleFactor;
  
          return Object.keys(model)
              .map(function (value) {return typeof value === 'object' ? value.text : value})
              .map(function (value) { return this.splitTextToSize(value, columnWidths[value] - padding - padding) }, this)
              .map(function (value) { return this.getLineHeightFactor() * value.length * fontSize / scaleFactor + padding + padding }, this)
              .reduce(function (pv, cv) { return Math.max(pv, cv) }, 0);
      }
docs: Calculate the height for containing the highest column
  
  @name calculateLineHeight
  @function
  @param {Object[]} model is the line of data we want to calculate the height of
  @param {Integer[]} columnWidths is size of each column
  @returns {number} lineHeight
  @private