Merge pull request #3036 from unoplatform/dev/jela/sealed-default

fix: Remove the sealed attribute from generated code (#2830)

src/SourceGenerators/Uno.UI.SourceGenerators/XamlGenerator/XamlFileGenerator.cs

@@ -297,7 +297,7 @@ private string InnerGenerateFile()
 
 					var controlBaseType = GetType(topLevelControl.Type);
 
-					using (writer.BlockInvariant("public sealed partial class {0} : {1}", _className.className, controlBaseType.ToDisplayString()))
+					using (writer.BlockInvariant("public partial class {0} : {1}", _className.className, controlBaseType.ToDisplayString()))
 					{
 						var isDirectUserControlChild = IsUserControl(topLevelControl.Type, checkInheritance: false);
 

src/SourceGenerators/XamlGenerationTests/InheritingPageTest.xaml

@@ -0,0 +1,14 @@
+<Page
+    x:Class="XamlGenerationTests.InheritingPageTest"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:XamlGenerationTests"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d"
+    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+
+    <Grid>
+
+    </Grid>
+</Page>

src/SourceGenerators/XamlGenerationTests/InheritingPageTest.xaml.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Controls.Primitives;
+using Windows.UI.Xaml.Data;
+using Windows.UI.Xaml.Input;
+using Windows.UI.Xaml.Media;
+using Windows.UI.Xaml.Navigation;
+
+// The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=234238
+
+namespace XamlGenerationTests
+{
+	/// <summary>
+	/// An empty page that can be used on its own or navigated to within a Frame.
+	/// </summary>
+	public partial class InheritingPageTest : Page
+	{
+		public InheritingPageTest()
+		{
+			this.InitializeComponent();
+		}
+	}
+
+	public partial class InheritingPageTest2 : InheritingPageTest
+	{
+
+	}
+}