Index: trunk/src/extobj.c
===================================================================
--- trunk/src/extobj.c	(revision 28895)
+++ trunk/src/extobj.c	(revision 28896)
@@ -105,7 +105,7 @@
 	return NULL;
 }
 
-void pcb_extobj_new_subc(pcb_any_obj_t *edit_obj, pcb_subc_t *subc_copy_from)
+pcb_extobj_float_new_spawn(pcb_subc_t *subc_copy_from, pcb_any_obj_t *edit_obj)
 {
 	pcb_data_t *data = pcb_extobj_parent_data(edit_obj);
 	pcb_board_t *pcb;
@@ -115,15 +115,16 @@
 	if (pcb == NULL)
 		return;
 
-	if (subc_copy_from == NULL) {
-		sc = pcb_subc_new();
-		sc->ID = pcb_create_ID_get();
-		pcb_subc_reg(pcb->Data, sc);
-		pcb_obj_id_reg(pcb->Data, sc);
-	}
-	else
-		sc = pcb_subc_dup_at(pcb, pcb->Data, subc_copy_from, 0, 0, pcb_false);
+	sc = pcb_subc_new();
+	sc->ID = pcb_create_ID_get();
+	pcb_subc_reg(pcb->Data, sc);
+	pcb_obj_id_reg(pcb->Data, sc);
 
+TODO("copy layers");
+
+	if (subc_copy_from != NULL)
+		pcb_attribute_copy_all(&sc->Attributes, &subc_copy_from->Attributes);
+
 	pcb_undo_add_obj_to_create(PCB_OBJ_SUBC, sc, sc, sc);
 
 TODO("put edit_obj within the new subc, set subc attributes");
@@ -132,6 +133,7 @@
 	pcb_extobj_float_geo(edit_obj);
 }
 
+
 void pcb_extobj_del_pre(pcb_subc_t *sc)
 {
 	pcb_extobj_t *eo = pcb_extobj_get(sc);
@@ -197,3 +199,4 @@
 	return res;
 }
 
+
Index: trunk/src/extobj.h
===================================================================
--- trunk/src/extobj.h	(revision 28895)
+++ trunk/src/extobj.h	(revision 28896)
@@ -45,6 +45,11 @@
 	PCB_EXTODEL_SUBC       /* remove the whole subcircuit */
 } pcb_extobj_del_t;
 
+typedef enum pcb_extobj_new_e {
+	PCB_EXTONEW_FLOATER,   /* new floater created normally */
+	PCB_EXTONEW_SPAWN      /* spawn a new subc the new floater will be in */
+} pcb_extobj_new_t;
+
 struct pcb_extobj_s {
 	/* static data - filled in by the extobj code */
 	const char *name;
@@ -51,7 +56,7 @@
 	void (*draw_mark)(pcb_draw_info_t *info, pcb_subc_t *obj); /* called when drawing the subc marks (instead of drawing the dashed outline and diamond origin) */
 	void (*float_pre)(pcb_subc_t *subc, pcb_any_obj_t *floater); /* called before an extobj floater is edited in any way - must not free() the floater */
 	void (*float_geo)(pcb_subc_t *subc, pcb_any_obj_t *floater); /* called after the geometry of an extobj floater is changed - must not free() the floater; floater may be NULL (post-floater-deletion update on the parent subc) */
-	void (*float_new)(pcb_subc_t *subc, pcb_any_obj_t *floater); /* called when a floater object is split so a new floater is created */
+	pcb_extobj_new_t (*float_new)(pcb_subc_t *subc, pcb_any_obj_t *floater); /* called when a floater object is split so a new floater is created; defaults to PCB_EXTONEW_SPAWN if NULL */
 	pcb_extobj_del_t (*float_del)(pcb_subc_t *subc, pcb_any_obj_t *floater); /* called when a floater object is to be removed; returns what the core should do; if not specified: remove the subc */
 	void (*chg_attr)(pcb_subc_t *subc, const char *key, const char *value); /* called after an attribute changed; value == NULL means attribute is deleted */
 	void (*del_pre)(pcb_subc_t *subc); /* called before the extobj subcircuit is deleted - should free any internal cache, but shouldn't delete the subcircuit */
@@ -70,10 +75,6 @@
 
 pcb_extobj_t *pcb_extobj_lookup(const char *name);
 
-/* Create a new subc for for new the edit_obj; if subc_copy_from is not NULL,
-   copy all data from there (including objects). */
-void pcb_extobj_new_subc(pcb_any_obj_t *edit_obj, pcb_subc_t *subc_copy_from);
-
 /* Called to remove the subc of an edit object floater; returns 0 on no
    action, 1 if it removed an extobj subc */
 PCB_INLINE int pcb_extobj_del_floater(pcb_any_obj_t *edit_obj);
@@ -89,7 +90,11 @@
 pcb_subc_t *pcb_extobj_conv_all_objs(pcb_board_t *pcb, const pcb_extobj_t *eo, pcb_data_t *dst, pcb_data_t *src, pcb_bool remove);
 pcb_subc_t *pcb_extobj_conv_obj(pcb_board_t *pcb, const pcb_extobj_t *eo, pcb_data_t *dst, pcb_any_obj_t *src, pcb_bool remove);
 
+/* for internal use: when an extobj needs to be cloned becase a new floater
+   is added */
+void pcb_extobj_float_new_spawn(pcb_subc_t *subc, pcb_any_obj_t *flt);
 
+
 int pcb_extobj_lookup_idx(const char *name);
 
 extern int pcb_extobj_invalid; /* this changes upon each new extobj reg, forcing the caches to be invalidated eventually */
@@ -184,6 +189,7 @@
 {
 	pcb_subc_t *subc = pcb_obj_parent_subc(flt);
 	pcb_extobj_t *eo;
+	pcb_extobj_new_t act = PCB_EXTONEW_SPAWN;
 
 	if (subc == NULL)
 		return;
@@ -191,7 +197,16 @@
 	eo = pcb_extobj_get(subc);
 
 	if ((eo != NULL) && (eo->float_new != NULL))
-		eo->float_new(subc, flt);
+		act = eo->float_new(subc, flt);
+
+	switch(act) {
+		case PCB_EXTONEW_FLOATER:
+			/* no action required, the new floater got created already and got registered in the hook above */
+			break;
+		case PCB_EXTONEW_SPAWN:
+			pcb_extobj_float_new_spawn(subc, flt);
+			break;
+	}
 }
 
 PCB_INLINE pcb_any_obj_t *pcb_extobj_float_pre(pcb_any_obj_t *flt)
Index: trunk/src/obj_common.c
===================================================================
--- trunk/src/obj_common.c	(revision 28895)
+++ trunk/src/obj_common.c	(revision 28896)
@@ -133,22 +133,6 @@
 
 	for (i = 0; i < src->Number; i++)
 		pcb_attribute_put(dest, src->List[i].name, src->List[i].value);
-
-TODO("extobj: this code used to dup the subc if a new object got added - check if we still need it with floaters");
-#if 0
-	if (copy_from_any != NULL) {
-		if (PCB_FLAG_TEST(PCB_FLAG_FLOATER, copy_from_any))
-			copy_from = pcb_obj_parent_subc(copy_from_any);
-		else if (copy_from_any->type == PCB_OBJ_SUBC)
-			copy_from = (pcb_subc_t *)copy_from_any;
-
-		if (pcb_extobj_get(copy_from) == NULL)
-			copy_from = NULL;
-	}
-
-	if (copy_from != NULL)
-		pcb_extobj_new_subc(dstobj, copy_from);
-#endif
 }
 
 
Index: trunk/src_plugins/exto_std/dimension.c
===================================================================
--- trunk/src_plugins/exto_std/dimension.c	(revision 28895)
+++ trunk/src_plugins/exto_std/dimension.c	(revision 28896)
@@ -304,9 +304,10 @@
 
 }
 
-static void pcb_dimension_float_new(pcb_subc_t *subc, pcb_any_obj_t *floater)
+static pcb_extobj_new_t pcb_dimension_float_new(pcb_subc_t *subc, pcb_any_obj_t *floater)
 {
 	pcb_trace("dim: float new %ld %ld\n", subc->ID, floater->ID);
+	return PCB_EXTONEW_SPAWN;
 }
 
 static pcb_extobj_del_t pcb_dimension_float_del(pcb_subc_t *subc, pcb_any_obj_t *floater)
Index: trunk/src_plugins/exto_std/line_of_vias.c
===================================================================
--- trunk/src_plugins/exto_std/line_of_vias.c	(revision 28895)
+++ trunk/src_plugins/exto_std/line_of_vias.c	(revision 28896)
@@ -195,9 +195,10 @@
 	line_of_vias_gen(subc, edit_obj);
 }
 
-static void pcb_line_of_vias_float_new(pcb_subc_t *subc, pcb_any_obj_t *floater)
+static pcb_extobj_new_t pcb_line_of_vias_float_new(pcb_subc_t *subc, pcb_any_obj_t *floater)
 {
 	pcb_trace("LoV: float new %ld %ld\n", subc->ID, floater->ID);
+	return PCB_EXTONEW_FLOATER;
 }
 
 static pcb_extobj_del_t pcb_line_of_vias_float_del(pcb_subc_t *subc, pcb_any_obj_t *floater)