SwipeView Fix #22580 (#22741)

Co-authored-by: Javier Suárez <javiersuarezruiz@hotmail.com>

src/Controls/src/Core/SwipeView/SwipeView.Mapper.cs

@@ -0,0 +1,39 @@
+using System;
+using Microsoft.Maui.Controls.Compatibility;
+
+namespace Microsoft.Maui.Controls
+{
+	public partial class SwipeView
+	{
+		[Obsolete("Use SwipeViewHandler.Mapper instead.")]
+		internal static IPropertyMapper<ISwipeView, ISwipeViewHandler> ControlsSwipeMapper =
+			new ControlsMapper<SwipeView, SwipeViewHandler>(SwipeViewHandler.Mapper);
+
+		internal static new void RemapForControls()
+		{
+			// Adjusted the mapping to preserve SwipeView.Entry legacy behavior
+			SwipeViewHandler.Mapper.AppendToMapping<SwipeView, ISwipeViewHandler>(nameof(Background), MapBackground);
+		}
+
+		static void MapBackground(ISwipeViewHandler handler, SwipeView swipeView)
+		{
+			if (swipeView.Content is not null)
+			{
+				var contentBackgroundIsNull = Brush.IsNullOrEmpty(swipeView.Content.Background);
+				var contentBackgroundColorIsNull = swipeView.Content.BackgroundColor == null;
+
+				if (contentBackgroundIsNull && contentBackgroundColorIsNull)
+				{
+					if (!Brush.IsNullOrEmpty(swipeView.Background))
+					{
+						swipeView.Content.Background = swipeView.Background;
+					}
+					else if (swipeView.BackgroundColor != null)
+					{
+						swipeView.Content.BackgroundColor = swipeView.BackgroundColor;
+					}
+				}
+			}
+		}
+	}
+}

src/Controls/src/Xaml/Hosting/AppHostBuilderExtensions.cs

@@ -242,6 +242,7 @@ internal static MauiAppBuilder RemapForControls(this MauiAppBuilder builder)
 			Window.RemapForControls();
 			Editor.RemapForControls();
 			Entry.RemapForControls();
+			SwipeView.RemapForControls();
 			Picker.RemapForControls();
 			SearchBar.RemapForControls();
 			TabbedPage.RemapForControls();