Index: src/cairo-hull.c
===================================================================
RCS file: /cvs/cairo/cairo/src/cairo-hull.c,v
retrieving revision 1.9
diff -u -r1.9 cairo-hull.c
--- src/cairo-hull.c	21 Aug 2005 18:41:44 -0000	1.9
+++ src/cairo-hull.c	29 Sep 2005 23:51:37 -0000
@@ -41,6 +41,7 @@
     cairo_point_t point;
     cairo_slope_t slope;
     int discard;
+    int id;
 } cairo_hull_t;
 
 static cairo_hull_t *
@@ -70,10 +71,14 @@
 	_cairo_slope_init (&hull[i].slope, &hull[0].point, &hull[i].point);
 
 	/* Discard all points coincident with the extremal point */
-	if (i != 0 && hull[i].slope.dx == 0 && hull[i].slope.dy == 0)
+	if (i != 0 && hull[i].slope.dx == 0 && hull[i].slope.dy == 0) {
 	    hull[i].discard = 1;
-	else
+            hull[i].id = -i;
+        } else {
 	    hull[i].discard = 0;
+            hull[i].id = i;
+        }
+        hull[i].discard = 0;
     }
 
     return hull;
@@ -102,7 +107,7 @@
 	 * a well-defined ordering, and avoid setting discard on
 	 * both points.
 	 */
-	if (a_dist < b_dist || (a_dist == b_dist && a < b)) {
+	if (a_dist < b_dist || (a_dist == b_dist && a->id < b->id)) {
 	    a->discard = 1;
 	    ret = -1;
 	} else {