Fixed the unused Polygonal2DSelection(List, int, int) constructor.

src/main/java/com/sk89q/worldedit/bukkit/selections/Polygonal2DSelection.java

@@ -41,18 +41,7 @@ public class Polygonal2DSelection extends RegionSelection {
         maxY = Math.min(Math.max(0, maxY), 127);
 
         Polygonal2DRegionSelector sel = new Polygonal2DRegionSelector();
-        poly2d = sel.getIncompleteRegion();
+        poly2d = new Polygonal2DRegion(points, minY, maxY);
-        
-        for (BlockVector2D pt : points) {
-            if (pt == null) {
-                throw new IllegalArgumentException("Null point not permitted");
-            }
-            
-            poly2d.addPoint(pt);
-        }
-        
-        poly2d.setMinimumY(minY);
-        poly2d.setMaximumY(maxY);
 
         sel.learnChanges();