Index: obj_subc.h
===================================================================
--- obj_subc.h	(revision 28116)
+++ obj_subc.h	(revision 28117)
@@ -52,6 +52,8 @@
 	pcb_line_t *aux_cache[PCB_SUBCH_max];
 	pcb_layer_t *aux_layer;
 	const char *refdes; /* cached from attributes for fast lookup */
+	int part_changed_inhibit;
+	unsigned part_changed_bbox_dirty:1; /* part_changed_inhibit_dec() should recalculate the bbox */
 	gdl_elem_t link;
 };
 
@@ -149,7 +151,10 @@
 /* Update the subcircuit (e.g. bbox) after a part of the subcircuit has changed */
 void pcb_subc_part_changed_(pcb_any_obj_t *obj);
 #define pcb_subc_part_changed(obj) pcb_subc_part_changed_((pcb_any_obj_t *)obj)
+void pcb_subc_part_changed_inhibit_inc(pcb_subc_t *sc);
+void pcb_subc_part_changed_inhibit_dec(pcb_subc_t *sc);
 
+
 /*** subc creation helpers ***/
 
 /* Create the aux layer for a subc, set origin to ox;oy and rotation to rot */