Add extra Automation event cleanup

Author: govert

Source/ExcelDna.IntelliSense.Host/ExcelDna.IntelliSense.Host.csproj

@@ -60,9 +60,6 @@
     </Content>
   </ItemGroup>
   <ItemGroup>
-    <None Include="ExcelDna.IntelliSense.Host-AddIn.xll.config">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </None>
     <None Include="packages.config" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

Source/ExcelDna.IntelliSense/UIMonitor/UIMonitor.cs

@@ -4,6 +4,7 @@
 using System.Linq;
 using System.Threading;
 using System.Windows;
+using System.Windows.Automation;
 
 namespace ExcelDna.IntelliSense
 {
@@ -645,6 +646,9 @@ public void Dispose()
                         _popupListWatcher.Dispose();
                         _popupListWatcher = null;
                     }
+                    // Try to clean up any stray event handlers too...
+                    Automation.RemoveAllEventHandlers();
+
                 }, null);
 
             // Let the above delegate and nested calls run, then clean up.