Index: polygon.c
===================================================================
--- polygon.c	(revision 30056)
+++ polygon.c	(revision 30057)
@@ -926,7 +926,7 @@
 
 static pcb_bool inhibit = pcb_false;
 
-int pcb_poly_init_clip_prog(pcb_data_t *Data, pcb_layer_t *layer, pcb_poly_t *p, void (*cb)(void *ctx), void *ctx)
+int pcb_poly_init_clip_prog(pcb_data_t *Data, pcb_layer_t *layer, pcb_poly_t *p, void (*cb)(void *ctx), void *ctx, int force)
 {
 	pcb_board_t *pcb;
 	pcb_bool need_full;
@@ -936,7 +936,7 @@
 	if (inhibit)
 		return 0;
 
-	if (Data->clip_inhibit > 0) {
+	if ((!force) && (Data->clip_inhibit > 0)) {
 		p->clip_dirty = 1;
 		return 0;
 	}
@@ -953,6 +953,8 @@
 	}
 	pcb_poly_contours_free(&p->NoHoles);
 
+	p->clip_dirty = 0;
+
 	if (layer == NULL)
 		return 0;
 
@@ -982,9 +984,14 @@
 
 int pcb_poly_init_clip(pcb_data_t *Data, pcb_layer_t *layer, pcb_poly_t *p)
 {
-	return pcb_poly_init_clip_prog(Data, layer, p, NULL, NULL);
+	return pcb_poly_init_clip_prog(Data, layer, p, NULL, NULL, 0);
 }
 
+int pcb_poly_init_clip_force(pcb_data_t *Data, pcb_layer_t *layer, pcb_poly_t *p)
+{
+	return pcb_poly_init_clip_prog(Data, layer, p, NULL, NULL, 1);
+}
+
 pcb_cardinal_t pcb_poly_num_clears(pcb_data_t *data, pcb_layer_t *layer, pcb_poly_t *polygon)
 {
 	pcb_cardinal_t res;