Index: operation.h
===================================================================
--- operation.h	(revision 2273)
+++ operation.h	(revision 2274)
@@ -50,7 +50,7 @@
 	void (*rotate)(csch_sheet_t *sheet, csch_chdr_t *obj, csch_coord_t rcx, csch_coord_t rcy, double da, int undoable);
 	void (*rotate90)(csch_sheet_t *sheet, csch_chdr_t *obj, csch_coord_t rcx, csch_coord_t rcy, int n, int undoable);
 	void (*mirror)(csch_sheet_t *sheet, csch_chdr_t *obj, csch_coord_t mcx, csch_coord_t mcy, int mirx, int miry, int undoable);
-	void (*inst2spec)(csch_sheet_t *sheet, csch_chdr_t *obj, int undoable);
+	void (*inst2spec)(csch_sheet_t *sheet, csch_chdr_t *obj, const csch_chdr_t *in, int undoable);
 } csch_ops_t;
 
 
@@ -70,9 +70,9 @@
 void csch_move(csch_sheet_t *sheet, csch_chdr_t *obj, csch_coord_t dx, csch_coord_t dy, int undoable);
 void csch_copy(csch_sheet_t *sheet, csch_chdr_t *obj, csch_coord_t dx, csch_coord_t dy, int undoable);
 
-/* Copy inst (current final transformation) back to spec; this can be used
-   in a transformed group breakup to get all ex-member objects stay in place */
-void csch_inst2spec(csch_sheet_t *sheet, csch_chdr_t *obj, int undoable);
+/* Copy inst (current final transformation) of inst_from to spec of obj; this
+   can be used in a transformed group breakup to get all ex-member objects stay in place. */
+void csch_inst2spec(csch_sheet_t *sheet, csch_chdr_t *obj, const csch_chdr_t *inst_from, int undoable);
 
 /* Undoably rotate object by da radians around rcx;rcy; the original spec is moved */
 void csch_rotate(csch_sheet_t *sheet, csch_chdr_t *obj, csch_coord_t rcx, csch_coord_t rcy, double da, int undoable);