Incorrect Triangulation of simple 4 point set about poly2tri HOT 3 CLOSED

I'm maintaining the java version but this might be an issue with all releases. 

Just wierd that no one has noticed it before ;). I'll try to find the problem.

Thanks for finding this issue!

There was no problem with the triangulation. But there are some triangles that 
should be removed after the triangulation that is added as part of the 
algorithm. Is special cases the code doing that could remove the first left or 
right valid triangle in a PointSet triangulation. The PolygonSet triangulation 
was not affected and since that is what I use mostly myself this problem had 
not emerged.

You can add this fix until I get in touch with the C# maintainer for the fix.

In class: DTSweep
In method: private static void FinalizationConvexHull( DTSweepContext tcx )
After the line:         TurnAdvancingFrontConvex( tcx, n2, n3 );
Add this:

        n1 = tcx.Front.Tail.Prev;
        if( n1.Triangle.Contains( n1.Next.Point ) && n1.Triangle.Contains( n1.Prev.Point ) )
        {
            t1 = n1.Triangle.neighborAcross( n1.Point );
            RotateTrianglePair( n1.Triangle, n1.Point, t1, t1.OppositePoint( n1.Triangle, n1.Point ) );
        }                
        n1 = tcx.Front.Head.Next;
        if( n1.Triangle.Contains( n1.Prev.Point ) && n1.Triangle.Contains( n1.Next.Point ) )
        {
            t1 = n1.Triangle.NeighborAcross( n1.Point );
            RotateTrianglePair( n1.Triangle, n1.Point, t1, t1.OppositePoint( n1.Triangle, n1.Point ) );
        }                

Hope I didn't add a typo when converting my Java code to C# :-)

I just added Issue #15 for the c++ version, and then noticed this. Perhaps it 
is related? I'm also working with simple 4 point sets for now, so could this 
issue still exist in the c++ version?