code: function getMaxLengthLine(...texts) {
              let textSizes = texts.filter(x => !!x)
                  .map(x => x.node().getBBox().width);
  
              return d3Array.max(textSizes);
          }
docs: Figures out the max length of the tooltip lines
  @param  {D3Selection[]} texts    List of svg elements of each line
  @return {Number}                 Max size of the lines