Propagate xml invalidations to fix issue #28

Author: govert

Source/ExcelDna.IntelliSense/Providers/ExcelDnaIntelliSenseProvider.cs

@@ -114,6 +114,7 @@ public ExcelDnaIntelliSenseProvider()
             _loaderNotification.LoadNotification += loaderNotification_LoadNotification;
             _syncContextExcel = new ExcelSynchronizationContext();
             _xmlProvider = new XmlIntelliSenseProvider();
+            _xmlProvider.Invalidate += (sender, e) => OnInvalidate(null);
         }
 
         #region IIntelliSenseProvider implementation

Source/ExcelDna.IntelliSense/Providers/WorkbookIntelliSenseProvider.cs

@@ -118,6 +118,7 @@ public IEnumerable<FunctionInfo> GetFunctionInfos()
         public WorkbookIntelliSenseProvider()
         {
             _xmlProvider = new XmlIntelliSenseProvider();
+            _xmlProvider.Invalidate += ( sender, e) => OnInvalidate();
         }
 
         public void Initialize()