do not only add the first type of a namespace :)

src/Main/SharpDevelop/Dom/ProjectAssemblyModel.cs

@@ -86,10 +86,10 @@ namespace ICSharpCode.SharpDevelop.Dom
 							batchList.AddIfNotNull(namespaces.BatchUpdate());
 							namespaces.Add(ns);
 						}
+					}
 					batchList.AddIfNotNull(ns.Types.BatchUpdate());
 					ns.Types.Add(addedItem);
 				}
-				}
 				foreach (ITypeDefinitionModel removedItem in removedItems) {
 					if (namespaces.TryGetValue(removedItem.Namespace, out ns)) {
 						batchList.AddIfNotNull(ns.Types.BatchUpdate());