Index: trunk/src/undo_old.c
===================================================================
--- trunk/src/undo_old.c	(revision 31846)
+++ trunk/src/undo_old.c	(revision 31847)
@@ -1131,6 +1131,12 @@
 	pcb_poly_clear_from_poly(PCB->Data, Type, Ptr1, Ptr2);
 }
 
+void pcb_undo_add_obj_to_create_noclear(int Type, void *Ptr1, void *Ptr2, void *Ptr3)
+{
+	if (!Locked)
+		GetUndoSlot(PCB_UNDO_CREATE, PCB_OBJECT_ID(Ptr3), Type);
+}
+
 /* ---------------------------------------------------------------------------
  * adds an object to the list of objects with flags changed
  */
Index: trunk/src/undo_old.h
===================================================================
--- trunk/src/undo_old.h	(revision 31846)
+++ trunk/src/undo_old.h	(revision 31847)
@@ -44,6 +44,7 @@
 void pcb_undo_add_obj_to_rotate90(int, void *, void *, void *, rnd_coord_t, rnd_coord_t, unsigned int);
 void pcb_undo_add_obj_to_rotate(int Type, void *Ptr1, void *Ptr2, void *Ptr3, rnd_coord_t CenterX, rnd_coord_t CenterY, rnd_angle_t angle);
 void pcb_undo_add_obj_to_create(int, void *, void *, void *);
+void pcb_undo_add_obj_to_create_nocreate(int, void *, void *, void *);
 void pcb_undo_add_subc_to_otherside(int Type, void *Ptr1, void *Ptr2, void *Ptr3, rnd_coord_t yoff);
 void pcb_undo_add_obj_to_move_to_layer(int, void *, void *, void *);
 void pcb_undo_add_obj_to_flag(void *obj);
Index: trunk/src_plugins/lib_polyhelp/polyhelp.c
===================================================================
--- trunk/src_plugins/lib_polyhelp/polyhelp.c	(revision 31846)
+++ trunk/src_plugins/lib_polyhelp/polyhelp.c	(revision 31847)
@@ -95,7 +95,7 @@
 			n = v->next;
 			l = pcb_line_new(dst, v->point[0], v->point[1], n->point[0], n->point[1], thickness, clearance, flags);
 			if (undoable)
-				pcb_undo_add_obj_to_create(PCB_OBJ_LINE, dst, l, l);
+				pcb_undo_add_obj_to_create_noclear(PCB_OBJ_LINE, dst, l, l);
 
 			cnt++;
 		}
@@ -365,7 +365,7 @@
 	hatch_ctx_t *ctx = (hatch_ctx_t *)ctx_;
 	pcb_line_t *l = pcb_line_new(ctx->dst, x1, y1, x2, y2, ctx->thickness, ctx->clearance, ctx->flags);
 	if (ctx->undoable)
-		pcb_undo_add_obj_to_create(PCB_OBJ_LINE, ctx->dst, l, l);
+		pcb_undo_add_obj_to_create_noclear(PCB_OBJ_LINE, ctx->dst, l, l);
 }
 
 void pcb_cpoly_hatch_lines(pcb_layer_t *dst, const pcb_poly_t *src, pcb_cpoly_hatchdir_t dir, rnd_coord_t period, rnd_coord_t thickness, rnd_coord_t clearance, pcb_flag_t flags, rnd_bool undoable)