fix #574: "Add To Main List" context menu updates not always persisted across program runs

ILSpy/AssemblyList.cs

@@ -117,6 +117,21 @@ namespace ICSharpCode.ILSpy
 				);
 			}
 		}
+
+		internal void RefreshSave()
+		{
+			if (!dirty) {
+				dirty = true;
+				App.Current.Dispatcher.BeginInvoke(
+					DispatcherPriority.Background,
+					new Action(
+						delegate {
+							dirty = false;
+							AssemblyListManager.SaveList(this);
+						})
+				);
+			}
+		}
 		
 		internal void ClearCache()
 		{

ILSpy/TreeNodes/AssemblyTreeNode.cs

@@ -375,6 +375,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 					node.RaisePropertyChanged("Foreground");
 				}
 			}
+			MainWindow.Instance.CurrentAssemblyList.RefreshSave();
 		}
 	}
 }