[Android] CarouselView: Remove rounding from SizedItemContentView that results in off-by-one pixel error (dotnet#25411)

* Remove rounding from SizedItemContentView that results in off-by-one pixel error

* Don't override position for collection change notification if explicit scroll was performed.

* [tests] Fix screenshots for CarouselView tests

* Update test

* Update screenshots

* [test] Update uitest images

* main should not use net10

---------

Co-authored-by: Rui Marinho <me@ruimarinho.net>

Author: filipnavara

src/Controls/src/Core/Handlers/Items/Android/MauiCarouselRecyclerView.cs

@@ -13,6 +13,7 @@ public class MauiCarouselRecyclerView : MauiRecyclerView<CarouselView, ItemsView
 		CarouselViewLoopManager _carouselViewLoopManager;
 		int _oldPosition;
 		int _gotoPosition = -1;
+		int _scrollToCounter = 0;
 		bool _noNeedForScroll;
 		bool _initialized;
 		bool _isVisible;
@@ -183,6 +184,8 @@ public override void ScrollTo(ScrollToRequestEventArgs args)
 			if (_carouselViewLoopManager == null)
 				return;
 
+			_scrollToCounter++;
+
 			// Special case here
 			// We could have a race condition where we are scrolling our collection to center the first item
 			// And at the same time the user is requesting we go to a particular item
@@ -224,6 +227,7 @@ void CollectionItemsSourceChanged(object sender, System.Collections.Specialized.
 			var carouselPosition = Carousel.Position;
 			var currentItemPosition = observableItemsSource.GetPosition(Carousel.CurrentItem);
 			var count = observableItemsSource.Count;
+			var savedScrollToCounter = _scrollToCounter;
 
 			bool removingCurrentElement = currentItemPosition == -1;
 			bool removingLastElement = e.OldStartingIndex == count;
@@ -273,9 +277,13 @@ void CollectionItemsSourceChanged(object sender, System.Collections.Specialized.
 				GetDispatcher()
 					.Dispatch(() =>
 					{
-
-						SetCurrentItem(carouselPosition);
-						UpdatePosition(carouselPosition);
+						// If someone called explicit ScrollTo before the dispatched
+						// callback was delivered then don't override it.
+						if (_scrollToCounter == savedScrollToCounter)
+						{
+							SetCurrentItem(carouselPosition);
+							UpdatePosition(carouselPosition);
+						}
 
 						//If we are adding or removing the last item we need to update
 						//the inset that we give to items so they are centered

src/Controls/src/Core/Handlers/Items/Android/SizedItemContentView.cs

@@ -29,10 +29,10 @@ protected override void OnMeasure(int widthMeasureSpec, int heightMeasureSpec)
 			double targetHeight = _height();
 
 			if (!double.IsInfinity(targetWidth))
-				targetWidth = (int)Context.FromPixels(targetWidth);
+				targetWidth = Context.FromPixels(targetWidth);
 
 			if (!double.IsInfinity(targetHeight))
-				targetHeight = (int)Context.FromPixels(targetHeight);
+				targetHeight = Context.FromPixels(targetHeight);
 
 			if (Content.VirtualView.Handler is IPlatformViewHandler pvh)
 			{