From fff5c45e6d604a3a77c6c1074a233823954ec5db Mon Sep 17 00:00:00 2001
From: gaphor@gmail.com <gaphor@gmail.com@a8418922-720d-0410-834f-a69b97ada669>
Date: Tue, 27 Jan 2009 21:44:33 +0000
Subject: reparent cleanup

git-svn-id: http://svn.devjavu.com/gaphor/gaphas/trunk@2683 a8418922-720d-0410-834f-a69b97ada669
---
diff --git a/gaphas/tree.py b/gaphas/tree.py
index 469afce..906c40d 100644
--- a/gaphas/tree.py
+++ b/gaphas/tree.py
@@ -339,16 +339,12 @@ class Tree(object):
         if parent is self.get_parent(node):
             return
 
-	siblings = self._children[parent]
-
-        # Add to new parent's children:
-        self.get_siblings(node).remove(node)
+        # Remove all node references:
+        old_parent = self.get_parent(node)
+        self._children[old_parent].remove(node)
         self._nodes.remove(node)
-
-        try:
+        if old_parent:
             del self._parents[node]
-        except KeyError:
-            pass
 
         self._add(node, parent, index)
 
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