[XSG] Enable XSG on HostApp (#32039)

* [XSG] Enable XSG on HostApp

fix nullability issue

* remove required

Author: StephaneDelcroix

src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj

@@ -78,4 +78,7 @@
 
   <Import Project="$(MauiSrcDirectory)Maui.InTree.props" Condition=" '$(UseMaui)' != 'true' " />
 
+  <ItemGroup>
+    <MauiXaml Update="**\*.xaml" Inflator="SourceGen"  NoWarn="0612"/>
+  </ItemGroup>
 </Project>

src/Controls/tests/TestCases.HostApp/Issues/Issue14825.xaml.cs

@@ -9,7 +9,7 @@ public Issue14825()
 		InitializeComponent();
 	}
 
-	private async void CaptureButton_Clicked(object sender, EventArgs e)
+	private async void CaptureButton_Clicked(object? sender, EventArgs e)
 	{
 		IScreenshotResult? result = await myWebView.CaptureAsync();
 

src/Controls/tests/TestCases.HostApp/Issues/Issue20842.xaml.cs

@@ -13,8 +13,8 @@ public override string ToString()
 
 	public class PersonDataTemplateSelector : DataTemplateSelector
 	{
-		public required DataTemplate ValidTemplate { get; set; }
-		public required DataTemplate InvalidTemplate { get; set; }
+		public DataTemplate ValidTemplate { get; set; }
+		public DataTemplate InvalidTemplate { get; set; }
 
 		protected override DataTemplate OnSelectTemplate(object item, BindableObject container)
 		{

src/Controls/tests/TestCases.HostApp/Issues/Issue20903.xaml.cs

@@ -18,7 +18,7 @@ private void OnLabelBeingDoubleTapped(object? sender, TappedEventArgs e)
 		eventCountLabel.Text = _callbackCalledCount.ToString();
 	}
 
-	private void addDoubleTapHandlerButton_Clicked(object sender, EventArgs e)
+	private void addDoubleTapHandlerButton_Clicked(object? sender, EventArgs e)
 	{
 		TapGestureRecognizer doubleTapGestureRecognizer = new();
 		doubleTapGestureRecognizer.Tapped += OnLabelBeingDoubleTapped;

src/Controls/tests/TestCases.HostApp/Issues/Issue23868.xaml.cs

@@ -59,17 +59,17 @@ private async Task SimulateHttpRequest()
 			refreshView.IsRefreshing = false;
 		}
 
-		private async void OnUpdateDataClicked(object sender, EventArgs e)
+		private async void OnUpdateDataClicked(object? sender, EventArgs e)
 		{
 			await SimulateHttpRequest();
 		}
 
-		private void OnClearDataClicked(object sender, EventArgs e)
+		private void OnClearDataClicked(object? sender, EventArgs e)
 		{
 			Items.Clear();
 		}
 
-		private void OnRefreshing(object sender, EventArgs e)
+		private void OnRefreshing(object? sender, EventArgs e)
 		{
 			PullToRefreshCommand.Execute(null);
 		}

src/Controls/tests/TestCases.HostApp/Issues/Issue25724.xaml.cs

@@ -19,7 +19,7 @@ public Issue25724()
 			BindingContext = new Issue25724ViewModel();
 		}
 
-		void ToggleHeader(object sender, System.EventArgs e)
+		void ToggleHeader(object? sender, System.EventArgs e)
 		{
 			header = CollectionView.Header ?? header;
 
@@ -29,7 +29,7 @@ void ToggleHeader(object sender, System.EventArgs e)
 				CollectionView.Header = null;
 		}
 
-		void ToggleFooter(object sender, System.EventArgs e)
+		void ToggleFooter(object? sender, System.EventArgs e)
 		{
 			footer = CollectionView.Footer ?? footer;