ChangesOverlap(left, right, mergedChangeArr) {
        Debug.Assert(left.originalStart <= right.originalStart, 'Left change is not less than or equal to right change');
        Debug.Assert(left.modifiedStart <= right.modifiedStart, 'Left change is not less than or equal to right change');
        if (left.originalStart + left.originalLength >= right.originalStart || left.modifiedStart + left.modifiedLength >= right.modifiedStart) {
            const originalStart = left.originalStart;
            let originalLength = left.originalLength;
            const modifiedStart = left.modifiedStart;
            let modifiedLength = left.modifiedLength;
            if (left.originalStart + left.originalLength >= right.originalStart) {
                originalLength = right.originalStart + right.originalLength - left.originalStart;
            }
            if (left.modifiedStart + left.modifiedLength >= right.modifiedStart) {
                modifiedLength = right.modifiedStart + right.modifiedLength - left.modifiedStart;
            }
            mergedChangeArr[0] = new DiffChange(originalStart, originalLength, modifiedStart, modifiedLength);
            return true;
        }
        else {
            mergedChangeArr[0] = null;
            return false;
        }
    }
Returns true if the two changes overlap and can be merged into a single
change
@param left The left change
@param right The right change
@param mergedChange The merged change if the two overlap, null otherwise
@returns True if the two changes overlap