Possible bug Generalized Suffix Array - longestCommonSubsequence

[ghost]

To reproduce:

var GeneralizedSuffixArray = require('mnemonist/suffix-array').GeneralizedSuffixArray;

let gsa = new GeneralizedSuffixArray(["abcde", "ace"]);
let actual = gsa.longestCommonSubsequence();
let expected = "ace";
console.assert(actual == expected);

longestCommonSubsequence gives back "a" in this instance.

[Yomguithereal]

This is a duplicate of #196. There is indeed a bug here but I need quite a lot of time to fix it and I don't really have any incentive in the short term to do so. I will of course review a PR on the matter though.