[dia] UML Lifeline: allowed to delete one connection point too much

[Hans Breuer <hans src gnome org>]

commit 465be40fe16ff964035018e9e5b3c03a1291d166
Author: Hans Breuer <hans breuer org>
Date:   Tue Oct 2 21:09:04 2012 +0200

    UML Lifeline: allowed to delete one connection point too much
    
    found by the recently added get_object_menu() unit test.

 objects/UML/lifeline.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/objects/UML/lifeline.c b/objects/UML/lifeline.c
index 8d472c6..92060d2 100644
--- a/objects/UML/lifeline.c
+++ b/objects/UML/lifeline.c
@@ -555,10 +555,11 @@ lifeline_get_object_menu(Lifeline *lifeline, Point *clickedpoint)
              lifeline->southeast->num_connections) );
 
   object_menu_items[0].active = 1;
+  /* don't allow to remove the last connection point */
   if (lifeline_point_above_mid (lifeline, clickedpoint))
-    object_menu_items[1].active = (lifeline->northeast->num_connections > 0);
+    object_menu_items[1].active = (lifeline->northeast->num_connections > 1);
   else
-    object_menu_items[1].active = (lifeline->southeast->num_connections > 0);
+    object_menu_items[1].active = (lifeline->southeast->num_connections > 1);
 
   return &object_menu;
 }