fix(pointers): Make sure to abort drag manipulation as soon as possib…

…le if not touch pointer

src/Uno.UI/UI/Xaml/Controls/ScrollContentPresenter/ScrollContentPresenter.Managed.cs

@@ -106,7 +106,6 @@ public ScrollContentPresenter()
 			// Touch scroll support
 			ManipulationMode = ManipulationModes.TranslateX | ManipulationModes.TranslateY; // Updated in PrepareTouchScroll!
 			ManipulationStarting += PrepareTouchScroll;
-			ManipulationStarted += BeginTouchScroll;
 			ManipulationDelta += UpdateTouchScroll;
 			ManipulationCompleted += CompleteTouchScroll;
 
@@ -238,6 +237,12 @@ private void ScrollContentPresenter_PointerWheelChanged(object sender, Input.Poi
 
 		private void PrepareTouchScroll(object sender, ManipulationStartingRoutedEventArgs e)
 		{
+			if (e.Pointer.Type != PointerDeviceType.Touch)
+			{
+				e.Mode = ManipulationModes.None;
+				return;
+			}
+
 			if (!CanVerticallyScroll || ExtentHeight <= 0)
 			{
 				e.Mode &= ~ManipulationModes.TranslateY;
@@ -249,15 +254,6 @@ private void PrepareTouchScroll(object sender, ManipulationStartingRoutedEventAr
 			}
 		}
 
-		private void BeginTouchScroll(object sender, ManipulationStartedRoutedEventArgs e)
-		{
-			if (e.PointerDeviceType != PointerDeviceType.Touch)
-			{
-				e.Complete();
-				return;
-			}
-		}
-
 		private void UpdateTouchScroll(object sender, ManipulationDeltaRoutedEventArgs e)
 			=> Set(
 				horizontalOffset: HorizontalOffset - e.Delta.Translation.X,