From d622ed9628fcc7c0017e407f14946e930cad337b 2011-06-20 23:39:15
From: MinRK <benjaminrk@gmail.com>
Date: 2011-06-20 23:39:15
Subject: [PATCH] use App.instance() in Application.initialize_subapp

This way later calls to App.instance() will return the running
application, whereas calling App() would create an isolated
Application object.

---

diff --git a/IPython/config/application.py b/IPython/config/application.py
index 16adbea..ae3dfa6 100644
--- a/IPython/config/application.py
+++ b/IPython/config/application.py
@@ -274,8 +274,10 @@ class Application(SingletonConfigurable):
         if isinstance(subapp, basestring):
             subapp = import_item(subapp)
         
+        # clear existing instances
+        self.__class__.clear_instance()
         # instantiate
-        self.subapp = subapp()
+        self.subapp = subapp.instance()
         # and initialize subapp
         self.subapp.initialize(argv)