Sync get-path-extents test with the one on 1.10.

The problem fixed by e9bb70d
had already been fixed on master by always computing exact extents:
89e1261

test/get-path-extents.c

@@ -187,7 +187,7 @@ draw (cairo_t *cr, int width, int height)
     cairo_restore (cr2);
 
     /* http://bugs.freedesktop.org/show_bug.cgi?id=7965 */
-    phase = "A vertical, open path";
+    phase = "A horizontal, open path";
     cairo_save (cr2);
     cairo_set_line_cap (cr2, CAIRO_LINE_CAP_ROUND);
     cairo_set_line_join (cr2, CAIRO_LINE_JOIN_ROUND);
@@ -199,6 +199,32 @@ draw (cairo_t *cr, int width, int height)
     cairo_new_path (cr2);
     cairo_restore (cr2);
 
+    phase = "A vertical, open path";
+    cairo_save (cr2);
+    cairo_set_line_cap (cr2, CAIRO_LINE_CAP_ROUND);
+    cairo_set_line_join (cr2, CAIRO_LINE_JOIN_ROUND);
+    cairo_new_path (cr2);
+    cairo_move_to (cr2, 180, 0);
+    cairo_line_to (cr2, 180, 750);
+    errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+    errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 175, -5, 10, 760);
+    errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 180, 0, 0, 750);
+    cairo_new_path (cr2);
+    cairo_restore (cr2);
+
+    phase = "A degenerate open path";
+    cairo_save (cr2);
+    cairo_set_line_cap (cr2, CAIRO_LINE_CAP_ROUND);
+    cairo_set_line_join (cr2, CAIRO_LINE_JOIN_ROUND);
+    cairo_new_path (cr2);
+    cairo_move_to (cr2, 180, 0);
+    cairo_line_to (cr2, 180, 0);
+    errors += !check_extents (ctx, phase, cr2, FILL, EQUALS, 0, 0, 0, 0);
+    errors += !check_extents (ctx, phase, cr2, STROKE, EQUALS, 175, -5, 10, 10);
+    errors += !check_extents (ctx, phase, cr2, PATH, EQUALS, 180, 0, 0, 0);
+    cairo_new_path (cr2);
+    cairo_restore (cr2);
+
     phase = "Simple rect";
     cairo_save (cr2);
     cairo_rectangle (cr2, 10, 10, 80, 80);