- Use a NotifyLock instead of (History|Simulation)::set_notify_enabled() method, which is more elegant and also exception-safe

- Delete set_notify_enabled() method from ConcreteHistory; it was both wrong and useless, and caused impredictable behaviour!
- Don't make some methods of History and Simulation virtual if we don't want the user to override them
- Loading from file and jumping to an instant of the simulation should be much quickier now

git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@1170 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/add_request_dialog.cc

@@ -166,7 +166,7 @@ AddRequestDialog::run_edit(Request& request)
   {
     assert(_list_model->children());
 
-    bool was_enabled = history.set_notify_enabled(false);
+    History::LockNotify h_lock(history);
 
     // I know it's a bit hack-ish, but do you know an elegant alternative way?
     for(Iseq<vector<SubRequest*>::iterator> it = iseq(subrequests); it; ++it)
@@ -178,8 +178,6 @@ AddRequestDialog::run_edit(Request& request)
 
     for(Iseq<TreeIter> it = iseq(sreq_container); it; ++it)
       history.add_subrequest(request, (*it)[_list_key_column], (*it)[_list_duration_column]);
-
-    history.set_notify_enabled(was_enabled);
   }
 
   hide();