Add Interactive.AddHandler() for CancelRoutedEventArgs

This hopefully fixes unit tests due to wrong overload being selected by the compiler.

src/Avalonia.Base/Interactivity/Interactive.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using Avalonia.Layout;
-using Avalonia.VisualTree;
 
 #nullable enable
 
@@ -67,7 +66,38 @@ namespace Avalonia.Interactivity
                 typedHandler(sender, typedArgs);
             }
 
-            var subscription = new EventSubscription(handler, routes, handledEventsToo, (baseHandler, sender, args) => InvokeAdapter(baseHandler, sender, args));
+            var subscription = new EventSubscription(handler, routes, handledEventsToo, InvokeAdapter);
+
+            AddEventSubscription(routedEvent, subscription);
+        }
+
+        /// <summary>
+        /// Adds a handler for the specified routed event.
+        /// </summary>
+        /// <param name="routedEvent">The routed event.</param>
+        /// <param name="handler">The handler.</param>
+        /// <param name="routes">The routing strategies to listen to.</param>
+        /// <param name="handledEventsToo">Whether handled events should also be listened for.</param>
+        public void AddHandler(
+            RoutedEvent<CancelRoutedEventArgs> routedEvent,
+            EventHandler<CancelRoutedEventArgs>? handler,
+            RoutingStrategies routes = RoutingStrategies.Direct | RoutingStrategies.Bubble,
+            bool handledEventsToo = false)
+        {
+            routedEvent = routedEvent ?? throw new ArgumentNullException(nameof(routedEvent));
+
+            if (handler is null)
+                return;
+
+            static void InvokeAdapter(Delegate baseHandler, object sender, RoutedEventArgs args)
+            {
+                var typedHandler = (EventHandler<CancelRoutedEventArgs>)baseHandler;
+                var typedArgs = (CancelRoutedEventArgs)args;
+
+                typedHandler(sender, typedArgs);
+            }
+
+            var subscription = new EventSubscription(handler, routes, handledEventsToo, InvokeAdapter);
 
             AddEventSubscription(routedEvent, subscription);
         }