From 47d1fe70822c3b4ec83dd6a82bf8181fbdd9f631 Mon Sep 17 00:00:00 2001
From: Sebastiaan Janssen <sebastiaan@umbraco.com>
Date: Wed, 19 Dec 2012 09:05:23 -0100
Subject: [PATCH] Fixed U4-703 - Updating or re-installing package causes
 duplicate trees

---
 src/umbraco.businesslogic/ApplicationTree.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/umbraco.businesslogic/ApplicationTree.cs b/src/umbraco.businesslogic/ApplicationTree.cs
index d5a4ff4ffa..67faf9b7ec 100644
--- a/src/umbraco.businesslogic/ApplicationTree.cs
+++ b/src/umbraco.businesslogic/ApplicationTree.cs
@@ -260,6 +260,10 @@ namespace umbraco.BusinessLogic
 
             LoadXml(doc =>
             {
+                var el = doc.Root.Elements("add").SingleOrDefault(x => x.Attribute("alias").Value == alias && x.Attribute("application").Value == applicationAlias);
+
+                if (el == null)
+                {
                 doc.Root.Add(new XElement("add",
                     new XAttribute("silent", silent),
                     new XAttribute("initialize", initialize),
@@ -272,6 +276,7 @@ namespace umbraco.BusinessLogic
                     new XAttribute("assembly", assemblyName),
                     new XAttribute("type", type),
                     new XAttribute("action", string.IsNullOrEmpty(action) ? "" : action)));
+                }
             }, true);
         }