Index: trunk/src/libcschem/cnc_any_obj.c
===================================================================
--- trunk/src/libcschem/cnc_any_obj.c	(revision 1483)
+++ trunk/src/libcschem/cnc_any_obj.c	(revision 1484)
@@ -56,20 +56,20 @@
 }
 
 
-csch_chdr_t *csch_cobj_dup(csch_sheet_t *sheet, csch_cgrp_t *grp, const csch_chdr_t *src)
+csch_chdr_t *csch_cobj_dup(csch_sheet_t *sheet, csch_cgrp_t *grp, const csch_chdr_t *src, int keep_id)
 {
 	void *dst;
 
 	switch(src->type) {
 		case CSCH_CTYPE_invalid:  return NULL;
-		case CSCH_CTYPE_LINE:     dst = csch_line_dup(sheet, grp, (const csch_line_t *)src); break;
-		case CSCH_CTYPE_ARC:      dst = csch_arc_dup(sheet, grp, (const csch_arc_t *)src); break;
-		case CSCH_CTYPE_POLY:     dst = csch_cpoly_dup(sheet, grp, (const csch_cpoly_t *)src); break;
-		case CSCH_CTYPE_BITMAP:   dst = csch_cbitmap_dup(sheet, grp, (const csch_cbitmap_t *)src); break;
+		case CSCH_CTYPE_LINE:     dst = csch_line_dup(sheet, grp, (const csch_line_t *)src, keep_id); break;
+		case CSCH_CTYPE_ARC:      dst = csch_arc_dup(sheet, grp, (const csch_arc_t *)src, keep_id); break;
+		case CSCH_CTYPE_POLY:     dst = csch_cpoly_dup(sheet, grp, (const csch_cpoly_t *)src, keep_id); break;
+		case CSCH_CTYPE_BITMAP:   dst = csch_cbitmap_dup(sheet, grp, (const csch_cbitmap_t *)src, keep_id); break;
 		case CSCH_CTYPE_CONN:     abort();
 		case CSCH_CTYPE_GRP:
-		case CSCH_CTYPE_GRP_REF:  dst = csch_cgrp_dup(sheet, grp, (const csch_cgrp_t *)src); break;
-		case CSCH_CTYPE_PEN:      dst = csch_pen_dup(sheet, grp, (const csch_cpen_t *)src); break;
+		case CSCH_CTYPE_GRP_REF:  dst = csch_cgrp_dup(sheet, grp, (const csch_cgrp_t *)src, keep_id); break;
+		case CSCH_CTYPE_PEN:      dst = csch_pen_dup(sheet, grp, (const csch_cpen_t *)src); break; /* id is name and is always kept */
 	}
 	return dst;
 }
Index: trunk/src/libcschem/cnc_any_obj.h
===================================================================
--- trunk/src/libcschem/cnc_any_obj.h	(revision 1483)
+++ trunk/src/libcschem/cnc_any_obj.h	(revision 1484)
@@ -27,7 +27,7 @@
 #include "concrete.h"
 
 void csch_cobj_free(csch_chdr_t *obj);
-csch_chdr_t *csch_cobj_dup(csch_sheet_t *sheet, csch_cgrp_t *grp, const csch_chdr_t *src);
+csch_chdr_t *csch_cobj_dup(csch_sheet_t *sheet, csch_cgrp_t *grp, const csch_chdr_t *src, int keep_id);
 void csch_cobj_update(csch_sheet_t *sheet, csch_chdr_t *src, int do_xform);
 int csch_cobj_attrib_set(csch_sheet_t *sheet, csch_chdr_t *obj, int prio, const char *key, const char *val, const csch_source_arg_t source);
 void csch_cobj_attrib_copy_all(csch_sheet_t *sheet, csch_chdr_t *dst, const csch_chdr_t *src);
Index: trunk/src/libcschem/cnc_arc.c
===================================================================
--- trunk/src/libcschem/cnc_arc.c	(revision 1483)
+++ trunk/src/libcschem/cnc_arc.c	(revision 1484)
@@ -48,7 +48,7 @@
 	return arc;
 }
 
-csch_arc_t *csch_arc_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_arc_t *src)
+csch_arc_t *csch_arc_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_arc_t *src, int keep_id)
 {
 	csch_arc_t *dst = csch_arc_alloc(sheet, parent, src->hdr.oid);
 	dst->inst = src->inst;
Index: trunk/src/libcschem/cnc_arc.h
===================================================================
--- trunk/src/libcschem/cnc_arc.h	(revision 1483)
+++ trunk/src/libcschem/cnc_arc.h	(revision 1484)
@@ -43,7 +43,7 @@
 } csch_arc_t;
 
 csch_arc_t *csch_arc_alloc(csch_sheet_t *sheet, csch_cgrp_t *parent, csch_oid_t oid);
-csch_arc_t *csch_arc_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_arc_t *src);
+csch_arc_t *csch_arc_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_arc_t *src, int keep_id);
 void csch_arc_free(csch_arc_t *arc);
 csch_arc_t *csch_arc_get(csch_sheet_t *sheet, csch_cgrp_t *grp, csch_oid_t oid);
 void csch_arc_update(csch_sheet_t *sheet, csch_arc_t *arc, int do_xform);
Index: trunk/src/libcschem/cnc_bitmap.c
===================================================================
--- trunk/src/libcschem/cnc_bitmap.c	(revision 1483)
+++ trunk/src/libcschem/cnc_bitmap.c	(revision 1484)
@@ -43,7 +43,7 @@
 	return bitmap;
 }
 
-csch_cbitmap_t *csch_cbitmap_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_cbitmap_t *src)
+csch_cbitmap_t *csch_cbitmap_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_cbitmap_t *src, int keep_id)
 {
 	csch_cbitmap_t *dst = csch_cbitmap_alloc(sheet, parent, src->hdr.oid);
 	dst->inst_x1 = src->inst_x1;
Index: trunk/src/libcschem/cnc_bitmap.h
===================================================================
--- trunk/src/libcschem/cnc_bitmap.h	(revision 1483)
+++ trunk/src/libcschem/cnc_bitmap.h	(revision 1484)
@@ -42,7 +42,7 @@
 } csch_cbitmap_t;
 
 csch_cbitmap_t *csch_cbitmap_alloc(csch_sheet_t *sheet, csch_cgrp_t *parent, csch_oid_t oid);
-csch_cbitmap_t *csch_cbitmap_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_cbitmap_t *src);
+csch_cbitmap_t *csch_cbitmap_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_cbitmap_t *src, int keep_id);
 void csch_cbitmap_free(csch_cbitmap_t *bitmap);
 csch_cbitmap_t *csch_cbitmap_get(csch_sheet_t *sheet, csch_cgrp_t *grp, csch_oid_t oid);
 
Index: trunk/src/libcschem/cnc_grp.c
===================================================================
--- trunk/src/libcschem/cnc_grp.c	(revision 1483)
+++ trunk/src/libcschem/cnc_grp.c	(revision 1484)
@@ -85,13 +85,13 @@
 {
 	htip_entry_t *e;
 	for(e = htip_first(&src->id2obj); e != NULL; e = htip_next(&src->id2obj, e))
-		csch_cobj_dup(sheet, dst, (csch_chdr_t *)e->value);
+		csch_cobj_dup(sheet, dst, (csch_chdr_t *)e->value, 1);
 	if (copy_attr)
 		csch_cobj_attrib_copy_all(sheet, &dst->hdr, &src->hdr);
 	return dst;
 }
 
-csch_cgrp_t *csch_cgrp_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_cgrp_t *src)
+csch_cgrp_t *csch_cgrp_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_cgrp_t *src, int keep_id)
 {
 	csch_cgrp_t *dst;
 	if (src->hdr.type == CSCH_CTYPE_GRP) {
Index: trunk/src/libcschem/cnc_grp.h
===================================================================
--- trunk/src/libcschem/cnc_grp.h	(revision 1483)
+++ trunk/src/libcschem/cnc_grp.h	(revision 1484)
@@ -47,7 +47,7 @@
 /*** standard calls on group refs ***/
 
 csch_cgrp_t *csch_cgrp_ref_alloc(csch_sheet_t *sheet, csch_cgrp_t *parent, csch_oid_t oid);
-csch_cgrp_t *csch_cgrp_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_cgrp_t *src);
+csch_cgrp_t *csch_cgrp_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_cgrp_t *src, int keep_id);
 void csch_cgrp_ref_free(csch_cgrp_t *grp);
 void csch_cgrp_ref_update(csch_sheet_t *sheet, csch_cgrp_t *grpref, int do_xform);
 
Index: trunk/src/libcschem/cnc_line.c
===================================================================
--- trunk/src/libcschem/cnc_line.c	(revision 1483)
+++ trunk/src/libcschem/cnc_line.c	(revision 1484)
@@ -48,7 +48,7 @@
 	return line;
 }
 
-csch_line_t *csch_line_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_line_t *src)
+csch_line_t *csch_line_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_line_t *src, int keep_id)
 {
 	csch_line_t *dst = csch_line_alloc(sheet, parent, src->hdr.oid);
 	dst->inst = src->inst;
Index: trunk/src/libcschem/cnc_line.h
===================================================================
--- trunk/src/libcschem/cnc_line.h	(revision 1483)
+++ trunk/src/libcschem/cnc_line.h	(revision 1484)
@@ -40,7 +40,7 @@
 } csch_line_t;
 
 csch_line_t *csch_line_alloc(csch_sheet_t *sheet, csch_cgrp_t *parent, csch_oid_t oid);
-csch_line_t *csch_line_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_line_t *src);
+csch_line_t *csch_line_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_line_t *src, int keep_id);
 void csch_line_free(csch_line_t *line);
 csch_line_t *csch_line_get(csch_sheet_t *sheet, csch_cgrp_t *grp, csch_oid_t oid);
 void csch_line_update(csch_sheet_t *sheet, csch_line_t *line, int do_xform);
Index: trunk/src/libcschem/cnc_poly.c
===================================================================
--- trunk/src/libcschem/cnc_poly.c	(revision 1483)
+++ trunk/src/libcschem/cnc_poly.c	(revision 1484)
@@ -52,7 +52,7 @@
 	return poly;
 }
 
-csch_cpoly_t *csch_cpoly_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_cpoly_t *src)
+csch_cpoly_t *csch_cpoly_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_cpoly_t *src, int keep_id)
 {
 	csch_cpoly_t *dst = csch_cpoly_alloc(sheet, parent, src->hdr.oid);
 	long n;
Index: trunk/src/libcschem/cnc_poly.h
===================================================================
--- trunk/src/libcschem/cnc_poly.h	(revision 1483)
+++ trunk/src/libcschem/cnc_poly.h	(revision 1484)
@@ -40,7 +40,7 @@
 } csch_cpoly_t;
 
 csch_cpoly_t *csch_cpoly_alloc(csch_sheet_t *sheet, csch_cgrp_t *parent, csch_oid_t oid);
-csch_cpoly_t *csch_cpoly_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_cpoly_t *src);
+csch_cpoly_t *csch_cpoly_dup(csch_sheet_t *sheet, csch_cgrp_t *parent, const csch_cpoly_t *src, int keep_id);
 void csch_cpoly_free(csch_cpoly_t *poly);
 csch_cpoly_t *csch_cpoly_get(csch_sheet_t *sheet, csch_cgrp_t *grp, csch_oid_t oid);
 void csch_poly_update(csch_sheet_t *sheet, csch_cpoly_t *poly, int do_xform);
Index: trunk/src/libcschem/operation.c
===================================================================
--- trunk/src/libcschem/operation.c	(revision 1483)
+++ trunk/src/libcschem/operation.c	(revision 1484)
@@ -117,7 +117,8 @@
 	csch_chdr_t *newo;
 	csch_op_remove(sheet, src);
 
-	newo = csch_cobj_dup(sheet, dst, src);
+TODO("undo problem: dup doesn't preserve oid and that may need to be undone");
+	newo = csch_cobj_dup(sheet, dst, src, 0);
 	csch_cobj_update(sheet, newo, 0);
 	csch_op_inserted(sheet, dst, newo);
 }