fix: Fix compilation on macOS

Author: David

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

@@ -45,12 +45,10 @@ private void OnParentChanged(object instance, object key, DependencyObjectParent
 			}
 		}
 
-#if XAMARIN
+#if __IOS__ || __ANDROID__
 		private NativeScrollContentPresenter Native => Content as NativeScrollContentPresenter;
-#if !__MACOS__
 		public ScrollBarVisibility HorizontalScrollBarVisibility => Native?.HorizontalScrollBarVisibility ?? default;
 		public ScrollBarVisibility VerticalScrollBarVisibility => Native?.VerticalScrollBarVisibility ?? default;
-#endif
 #endif
 
 		bool ILayoutConstraints.IsWidthConstrained(View requester)

src/Uno.UI/UI/Xaml/UIElement.macOS.cs

@@ -143,33 +143,14 @@ private bool TryGetParentUIElementForTransformToVisual(out UIElement parentEleme
 				case NSView view:
 					do
 					{
-						//If we found an NSClipView, we are assuming that we are inside of an NSScrollView.
-						//So "skip" past the NSClipView and allow the logic to flow through to the check for NativeScrollContentPresenter
-						if (view is NSClipView && view.Superview is NativeScrollContentPresenter)
-						{
-							parent = view.Superview?.GetParent();
-							view = view.Superview;
-						}
-						else
-						{
-							parent = parent?.GetParent();
-						}
+						parent = parent?.GetParent();
 
 						switch (parent)
 						{
 							case UIElement eltParent:
 								// We found a UIElement in the parent hierarchy, we compute the X/Y offset between the
 								// first parent 'view' and this 'elt', and return it.
 
-								if (view is NativeScrollContentPresenter)
-								{
-									// The NativeScrollContentPresenter will include the scroll offset when converting point to coordinates
-									// space of the parent, but the same scroll offset will be applied by the parent ScrollViewer.
-									// So as it's not expected to have any transform/margins/etc., we compute offset directly from its parent.
-
-									view = view.Superview;
-								}
-
 								var offset = view?.ConvertPointToView(default, eltParent) ?? default;
 
 								parentElement = eltParent;