private List <CT_Col> getOverlappingCols(CT_Col newCol, TreeSet <CT_Col> trackedCols)
{
CT_Col lower = trackedCols.Lower(newCol);
TreeSet <CT_Col> potentiallyOverlapping = lower == null ? trackedCols : trackedCols.TailSet(lower, overlaps(lower, newCol));
List <CT_Col> overlapping = new List <CT_Col>();
foreach (CT_Col existing in potentiallyOverlapping)
{
if (overlaps(newCol, existing))
{
overlapping.Add(existing);
}
else
{
break;
}
}
return(overlapping);
}