Index: trunk/src/libgrbs/route_remove.c
===================================================================
--- trunk/src/libgrbs/route_remove.c	(revision 1311)
+++ trunk/src/libgrbs/route_remove.c	(revision 1312)
@@ -36,7 +36,7 @@
 
 /* if there is anything above the new arc, shrink radius pushing the
    above-arcs lower (by exactly as much as twonet tn took) */
-static double shrink_seg_radii_any(grbs_t *grbs, grbs_arc_t *arc, int *need_narc_post_update, double *narc_oldr_out, int is_concave)
+static grbs_arc_t *shrink_seg_radii_any(grbs_t *grbs, grbs_arc_t *arc, int *need_narc_post_update, double *narc_oldr_out, int is_concave)
 {
 	grbs_arc_t *next, *prev;
 	double prev_copper, prev_clearance, newr, incr, prevr;
@@ -61,7 +61,7 @@
 	next = grbs_next_arc_in_use(arc);
 	if (next == NULL) {
 		*narc_oldr_out = 0;
-		return narcr;
+		return NULL;
 	}
 	narcr = next->r;
 
@@ -91,7 +91,7 @@
 
 	bump_seg_radii(grbs, next, incr);
 	*narc_oldr_out = narc_oldr;
-	return narcr;
+	return next;
 }
 
 
@@ -110,9 +110,9 @@
 
 void grbs_path_remove_arc(grbs_t *grbs, grbs_arc_t *arc)
 {
-	grbs_arc_t *narc, *a, *first;
+	grbs_arc_t *narc, *a, *first, *sarc, *sentinel;
 	int rev = 1, need_narc_post_update = 0;
-	double narcr, narc_oldr;
+	double narc_oldr;
 	grbs_point_t *pt;
 	int is_concave = arc->concave;
 
@@ -122,15 +122,20 @@
 	}
 
 			pt = arc->parent_pt;
-			first = gdl_first(&pt->arcs[is_concave][arc->segi]);
+			first = sentinel = gdl_first(&pt->arcs[is_concave][arc->segi]);
+			if (!first->new_in_use)
+				first = gdl_next(&pt->arcs[is_concave][arc->segi], first); /* for already realized arcs: first is the first above sentinel */
 
 			/* make room for the new arc */
-			narcr = shrink_seg_radii_any(grbs, arc, &need_narc_post_update, &narc_oldr, is_concave);
+			sarc = shrink_seg_radii_any(grbs, arc, &need_narc_post_update, &narc_oldr, is_concave);
+			if (arc == first) {
+				if (sarc != NULL)
+					update_seg_sentinel_angles(sentinel, sarc);
+				else {
+#warning TODO: remove sentinel
+				}
+			}
 
-#warning TODO: when lowest removed
-/*			if (arc == first)
-				update_seg_sentinel_angles(first, narc);*/
-
 #warning TODO
 #if 0
 			/* if we removed a convex, we need to bump any concave above it as well */