fix(reg): Fix the managed pointer ID handling

src/Uno.UI/Runtime/BrowserPointerInputSource.wasm.cs

@@ -122,6 +122,7 @@ private static int OnNativeEvent(
 				case HtmlPointerEvent.pointerup:
 					//case HtmlPointerEvent.lostpointercapture: // if pointer is captured, we don't get a up, just a capture lost (with skia for wasm)
 					that.PointerReleased?.Invoke(that, args);
+					_PointerIdentifierPool.ReleaseManaged(pointerIdentifier);
 					break;
 
 				case HtmlPointerEvent.pointermove:
@@ -147,6 +148,7 @@ private static int OnNativeEvent(
 
 				case HtmlPointerEvent.pointercancel:
 					that.PointerCancelled?.Invoke(that, args);
+					_PointerIdentifierPool.ReleaseManaged(pointerIdentifier);
 					break;
 
 				default:

src/Uno.UI/UI/Xaml/Internal/InputManager.Pointers.cs

@@ -71,12 +71,6 @@ public PointerManager(InputManager inputManager)
 				UIElement.PointerReleasedEvent,
 				new PointerEventHandler((snd, args) => ProcessPointerUp(args, false)),
 				handledEventsToo: true);
-#if __WASM__ && !UNO_HAS_MANAGED_POINTERS
-			rootElement.AddHandler(
-				UIElement.PointerCanceledEvent,
-				new PointerEventHandler((snd, args) => ProcessPointerCancelled(args)),
-				handledEventsToo: true);
-#endif
 		}
 
 		#region Re-routing (Flyout.OverlayInputPassThroughElement)
@@ -206,21 +200,12 @@ internal void ProcessPointerUp(PointerRoutedEventArgs args, bool isAfterHandledU
 
 			ReleaseCaptures(args.Reset(canBubbleNatively: false));
 
-#if __WASM__
-			PointerIdentifierPool.ReleaseManaged(args.Pointer.UniqueId);
-#endif
-
 			// At the end of our "up" processing, we reset the flag to make sure that the native handler (iOS, Android and WASM)
 			// won't try to sent it to us again (if not already the case ^^).
 			// (This could be the case if the args was flagged as handled in the ReleaseCaptures call above, like in RatingControl).
 			args.Handled = isAfterHandledUp;
 		}
 
-#if __WASM__
-		private static void ProcessPointerCancelled(PointerRoutedEventArgs args)
-			=> PointerIdentifierPool.ReleaseManaged(args.Pointer.UniqueId);
-#endif
-
 		// As focus event are either async or cancellable,
 		// the FocusManager will explicitly notify us instead of listing to its events
 		internal void NotifyFocusChanged()