Index: trunk/src/libcschem/cnc_line.c
===================================================================
--- trunk/src/libcschem/cnc_line.c	(revision 3558)
+++ trunk/src/libcschem/cnc_line.c	(revision 3559)
@@ -278,17 +278,18 @@
 
 /*** hash ***/
 
-unsigned csch_line_hash(const csch_line_t *line)
+unsigned csch_line_hash_(const csch_line_t *line, int in_contour)
 {
-	unsigned res = csch_chdr_hash(&line->hdr);
+	unsigned res = 0;
+	if (!in_contour) res ^= csch_chdr_hash(&line->hdr);
 	res ^= csch_coord_hash(line->spec.p1.x) + csch_coord_hash(line->spec.p2.x);
 	res ^= csch_coord_hash(line->spec.p1.y) + csch_coord_hash(line->spec.p2.y);
 	return res;
 }
 
-int csch_line_keyeq(const csch_line_t *l1, const csch_line_t *l2)
+int csch_line_keyeq_(const csch_line_t *l1, const csch_line_t *l2, int in_contour)
 {
-	if (!csch_chdr_eq(&l1->hdr, &l2->hdr)) return 0;
+	if (!in_contour && !csch_chdr_eq(&l1->hdr, &l2->hdr)) return 0;
 	if (l1->spec.p1.x != l2->spec.p1.x) return 0;
 	if (l1->spec.p1.y != l2->spec.p1.y) return 0;
 	if (l1->spec.p2.x != l2->spec.p2.x) return 0;
@@ -296,7 +297,18 @@
 	return 1;
 }
 
+unsigned csch_line_hash(const csch_line_t *line)
+{
+	return csch_line_hash_(line, 0);
+}
 
+int csch_line_keyeq(const csch_line_t *l1, const csch_line_t *l2)
+{
+	return csch_line_keyeq_(l1, l2, 0);
+}
+
+
+
 /*** Modify ***/
 typedef struct {
 	csch_line_t *line; /* it is safe to save the object pointer because it is persistent (through the removed object list) */
Index: trunk/src/libcschem/cnc_line.h
===================================================================
--- trunk/src/libcschem/cnc_line.h	(revision 3558)
+++ trunk/src/libcschem/cnc_line.h	(revision 3559)
@@ -45,7 +45,9 @@
 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);
 
+unsigned csch_line_hash_(const csch_line_t *line, int in_contour);
 unsigned csch_line_hash(const csch_line_t *line);
+int csch_line_keyeq_(const csch_line_t *l1, const csch_line_t *l2, int in_contour);
 int csch_line_keyeq(const csch_line_t *l1, const csch_line_t *l2);
 
 /* non-standard calls */