PrettifyChanges(changes) {
        // Shift all the changes down first
        for (let i = 0; i < changes.length; i++) {
            const change = changes[i];
            const originalStop = (i < changes.length - 1) ? changes[i + 1].originalStart : this._originalElementsOrHash.length;
            const modifiedStop = (i < changes.length - 1) ? changes[i + 1].modifiedStart : this._modifiedElementsOrHash.length;
            const checkOriginal = change.originalLength > 0;
            const checkModified = change.modifiedLength > 0;
            while (change.originalStart + change.originalLength < originalStop
                && change.modifiedStart + change.modifiedLength < modifiedStop
                && (!checkOriginal || this.OriginalElementsAreEqual(change.originalStart, change.originalStart + change.originalLength))
                && (!checkModified || this.ModifiedElementsAreEqual(change.modifiedStart, change.modifiedStart + change.modifiedLength))) {
                const startStrictEqual = this.ElementsAreStrictEqual(change.originalStart, change.modifiedStart);
                const endStrictEqual = this.ElementsAreStrictEqual(change.originalStart + change.originalLength, change.modifiedStart + change.modifiedLength);
                if (endStrictEqual && !startStrictEqual) {
                    // moving the change down would create an equal change, but the elements are not strict equal
                    break;
                }
                change.originalStart++;
                change.modifiedStart++;
            }
            const mergedChangeArr = [null];
            if (i < changes.length - 1 && this.ChangesOverlap(changes[i], changes[i + 1], mergedChangeArr)) {
                changes[i] = mergedChangeArr[0];
                changes.splice(i + 1, 1);
                i--;
                continue;
            }
        }
        // Shift changes back up until we hit empty or whitespace-only lines
        for (let i = changes.length - 1; i >= 0; i--) {
            const change = changes[i];
            let originalStop = 0;
            let modifiedStop = 0;
            if (i > 0) {
                const prevChange = changes[i - 1];
                originalStop = prevChange.originalStart + prevChange.originalLength;
                modifiedStop = prevChange.modifiedStart + prevChange.modifiedLength;
            }
            const checkOriginal = change.originalLength > 0;
            const checkModified = change.modifiedLength > 0;
            let bestDelta = 0;
            let bestScore = this._boundaryScore(change.originalStart, change.originalLength, change.modifiedStart, change.modifiedLength);
            for (let delta = 1;; delta++) {
                const originalStart = change.originalStart - delta;
                const modifiedStart = change.modifiedStart - delta;
                if (originalStart < originalStop || modifiedStart < modifiedStop) {
                    break;
                }
                if (checkOriginal && !this.OriginalElementsAreEqual(originalStart, originalStart + change.originalLength)) {
                    break;
                }
                if (checkModified && !this.ModifiedElementsAreEqual(modifiedStart, modifiedStart + change.modifiedLength)) {
                    break;
                }
                const touchingPreviousChange = (originalStart === originalStop && modifiedStart === modifiedStop);
                const score = ((touchingPreviousChange ? 5 : 0)
                    + this._boundaryScore(originalStart, change.originalLength, modifiedStart, change.modifiedLength));
                if (score > bestScore) {
                    bestScore = score;
                    bestDelta = delta;
                }
            }
            change.originalStart -= bestDelta;
            change.modifiedStart -= bestDelta;
            const mergedChangeArr = [null];
            if (i > 0 && this.ChangesOverlap(changes[i - 1], changes[i], mergedChangeArr)) {
                changes[i - 1] = mergedChangeArr[0];
                changes.splice(i, 1);
                i++;
                continue;
            }
        }
        // There could be multiple longest common substrings.
        // Give preference to the ones containing longer lines
        if (this._hasStrings) {
            for (let i = 1, len = changes.length; i < len; i++) {
                const aChange = changes[i - 1];
                const bChange = changes[i];
                const matchedLength = bChange.originalStart - aChange.originalStart - aChange.originalLength;
                const aOriginalStart = aChange.originalStart;
                const bOriginalEnd = bChange.originalStart + bChange.originalLength;
                const abOriginalLength = bOriginalEnd - aOriginalStart;
                const aModifiedStart = aChange.modifiedStart;
                const bModifiedEnd = bChange.modifiedStart + bChange.modifiedLength;
                const abModifiedLength = bModifiedEnd - aModifiedStart;
                // Avoid wasting a lot of time with these searches
                if (matchedLength < 5 && abOriginalLength < 20 && abModifiedLength < 20) {
                    const t = this._findBetterContiguousSequence(aOriginalStart, abOriginalLength, aModifiedStart, abModifiedLength, matchedLength);
                    if (t) {
                        const [originalMatchStart, modifiedMatchStart] = t;
                        if (originalMatchStart !== aChange.originalStart + aChange.originalLength || modifiedMatchStart !== aChange.modifiedStart + aChange.modifiedLength) {
                            // switch to another sequence that has a better score
                            aChange.originalLength = originalMatchStart - aChange.originalStart;
                            aChange.modifiedLength = modifiedMatchStart - aChange.modifiedStart;
                            bChange.originalStart = originalMatchStart + matchedLength;
                            bChange.modifiedStart = modifiedMatchStart + matchedLength;
                            bChange.originalLength = bOriginalEnd - bChange.originalStart;
                            bChange.modifiedLength = bModifiedEnd - bChange.modifiedStart;
                        }
                    }
                }
            }
        }
        return changes;
    }
Shifts the given changes to provide a more intuitive diff.
While the first element in a diff matches the first element after the diff,
we shift the diff down.

@param changes The list of changes to shift
@returns The shifted changes