pcbnew: Add edge polygons to pns keepout

Fixes: lp:1806846
* https://bugs.launchpad.net/kicad/+bug/1806846

pcbnew/router/pns_kicad_iface.cpp

@@ -956,6 +956,23 @@ bool PNS_KICAD_IFACE::syncGraphicalItem( PNS::NODE* aWorld, DRAWSEGMENT* aItem )
         }
         break;
 
+        case S_POLYGON:
+        {
+            if( !aItem->IsPolygonFilled() )
+            {
+                auto poly = aItem->BuildPolyPointsList();
+                for( size_t ii = 1; ii < poly.size(); ii++ )
+                {
+                    segs.push_back( new SHAPE_SEGMENT(
+                            VECTOR2I( poly[ii-1] ), VECTOR2I( poly[ii] ), aItem->GetWidth() ) );
+                }
+
+                segs.push_back( new SHAPE_SEGMENT(
+                        VECTOR2I( poly.back() ), VECTOR2I( poly.front() ), aItem->GetWidth() ) );
+            }
+        }
+        break;
+
         default:
             break;
     }