ComPDFKit.Demo(win) - 修复注释修改后无法触发保存的问题

Demo/Examples/Compdfkit.Controls/Annotation/AnnotationControl/AnnotationControl.xaml.cs

@@ -519,6 +519,7 @@ baseWidget.GetAnnotData().Annot);
         private void UndoManager_PropertyChanged(object sender, PropertyChangedEventArgs e)
         {
             OnPropertyChanged(e.PropertyName);
+            OnCanSaveChanged?.Invoke(this, CanSave);
         }
 
         private void PanelState_PropertyChanged(object sender, PropertyChangedEventArgs e)