chore: [Android] Fix list layouting

Ensure to call LayoutChild() every time, since the position may change even if measure hasn't changed (when scrolling, most obviously). Note that Android's internal layout caching logic ensures that ArrangeOverride() isn't called if not needed.

src/Uno.UI/UI/Xaml/Controls/ListViewBase/VirtualizingPanelLayout.Android.cs

@@ -899,6 +899,28 @@ protected Size AddViewAtOffset(View child, GeneratorDirection direction, int ext
 				slotSize = new Size(double.PositiveInfinity, logicalAvailableBreadth);
 			}
 
+			var size = TryMeasureChild(child, slotSize, viewType);
+
+			if (!child.IsInLayout)
+			{
+				UnoViewGroup.StartLayoutingFromMeasure();
+			}
+			LayoutChild(child, direction, extentOffset, breadthOffset, size);
+
+			if (!child.IsInLayout)
+			{
+				UnoViewGroup.EndLayoutingFromMeasure();
+			}
+
+			return size;
+		}
+
+		/// <summary>
+		/// Measure item view if needed.
+		/// </summary>
+		/// <returns>Measured size, or cached size if no measure was necessary.</returns>
+		private Size TryMeasureChild(View child, Size slotSize, ViewType viewType)
+		{
 			var previousAvailableSize = LayoutInformation.GetAvailableSize(child);
 
 			if (child.IsLayoutRequested || slotSize != previousAvailableSize)
@@ -910,17 +932,6 @@ protected Size AddViewAtOffset(View child, GeneratorDirection direction, int ext
 					size = ApplyChildStretch(size, slotSize, viewType);
 				}
 
-				if (!child.IsInLayout)
-				{
-					UnoViewGroup.StartLayoutingFromMeasure();
-				}
-				LayoutChild(child, direction, extentOffset, breadthOffset, size);
-
-				if (!child.IsInLayout)
-				{
-					UnoViewGroup.EndLayoutingFromMeasure();
-				}
-
 				return size;
 			}
 			else