[BUG] - Lattice - Inifity loop

[MathiasNysomFlohr]

Describe the bug
SpreadsheetExtractionAlgorithm sometimes runs in eternal loop

To Reproduce
The pdf is non-shareable.
It is 13.968 KB, 469 filled with tables. No tables has visible lines.

Expected behavior
Run through and identified tables properly.

Additional context
We have found the issue might lie in SpreadsheetExtractionAlgorithm, ll. 319-340.
We have tested this code and found it works (and seems to produce same results in final ouput of extraction):

``for (var i = 0; i + 1 < pointSet.Count; i++)
{
if (Utils.Feq(pointsSortY[i].Y, pointsSortY[i + 1].Y))
{
edgesH[pointsSortY[i]] = pointsSortY[i + 1];
edgesH[pointsSortY[i + 1]] = pointsSortY[i];
i++;
}
}

for (var i = 0; i + 1 < pointSet.Count; i++)
{
if (Utils.Feq(pointsSortX[i].X, pointsSortX[i + 1].X))
{
edgesV[pointsSortX[i]] = pointsSortX[i + 1];
edgesV[pointsSortX[i + 1]] = pointsSortX[i];
i++;
}
}``