Index: trunk/src/obj_poly.c
===================================================================
--- trunk/src/obj_poly.c	(revision 19692)
+++ trunk/src/obj_poly.c	(revision 19693)
@@ -946,7 +946,29 @@
 	return Polygon;
 }
 
+void pcb_poly_pre(pcb_poly_t *poly)
+{
+	pcb_layer_t *ly = pcb_layer_get_real(poly->parent.layer);
+	if (ly == NULL)
+		return;
 
+	pcb_poly_pprestore(poly);
+	if (ly->polygon_tree != NULL)
+		pcb_r_delete_entry(ly->polygon_tree, (pcb_box_t *)poly);
+}
+
+void pcb_poly_post(pcb_poly_t *poly)
+{
+	pcb_layer_t *ly = pcb_layer_get_real(poly->parent.layer);
+	if (ly == NULL)
+		return;
+
+	if (ly->polygon_tree != NULL)
+		pcb_r_insert_entry(ly->polygon_tree, (pcb_box_t *)poly);
+	pcb_poly_ppclear(poly);
+}
+
+
 /*** iteration helpers ***/
 void pcb_poly_map_contours(pcb_poly_t *p, void *ctx, pcb_poly_map_cb_t *cb)
 {
Index: trunk/src/obj_poly.h
===================================================================
--- trunk/src/obj_poly.h	(revision 19692)
+++ trunk/src/obj_poly.h	(revision 19693)
@@ -78,6 +78,9 @@
 void pcb_poly_move(pcb_poly_t *Polygon, pcb_coord_t DX, pcb_coord_t DY);
 pcb_poly_t *pcb_poly_copy(pcb_poly_t *Dest, pcb_poly_t *Src, pcb_coord_t dx, pcb_coord_t dy);
 
+void pcb_poly_pre(pcb_poly_t *poly);
+void pcb_poly_post(pcb_poly_t *poly);
+
 /* hash and eq */
 int pcb_poly_eq(const pcb_host_trans_t *tr1, const pcb_poly_t *p1, const pcb_host_trans_t *tr2, const pcb_poly_t *p2);
 unsigned int pcb_poly_hash(const pcb_host_trans_t *tr, const pcb_poly_t *p);