fix(codegen): BindableMetadata properly globalizing generic type pare…

…meters

src/SamplesApp/UITests.Shared/UITests.Shared.projitems

@@ -3057,6 +3057,10 @@
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
+    <Page Include="$(MSBuildThisFileDirectory)Xaml_CodeGen\BindableMetadataGlobalizationTest.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="$(MSBuildThisFileDirectory)Helpers\BindableBase.cs" />
@@ -5382,6 +5386,9 @@
     <Compile Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml\Enability\BasicEnability.xaml.cs">
       <DependentUpon>BasicEnability.xaml</DependentUpon>
     </Compile>
+    <Compile Include="$(MSBuildThisFileDirectory)Xaml_CodeGen\BindableMetadataGlobalizationTest.xaml.cs">
+      <DependentUpon>BindableMetadataGlobalizationTest.xaml</DependentUpon>
+    </Compile>
   </ItemGroup>
   <ItemGroup>
     <Content Include="$(MSBuildThisFileDirectory)Assets\AcrylicBrush.png" />

src/SamplesApp/UITests.Shared/Xaml_CodeGen/BindableMetadataGlobalizationTest.xaml

@@ -0,0 +1,8 @@
+<Page x:Class="UITests.Xaml_CodeGen.BindableMetadataGlobalizationTest"
+	  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+	  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+	  xmlns:local="using:UITests.Xaml_CodeGen"
+	  Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+
+	<Grid />
+</Page>

src/SamplesApp/UITests.Shared/Xaml_CodeGen/BindableMetadataGlobalizationTest.xaml.cs

@@ -0,0 +1,39 @@
+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 UITests.Xaml_CodeGen
+{
+	/// <summary>
+	/// An empty page that can be used on its own or navigated to within a Frame.
+	/// </summary>
+	public sealed partial class BindableMetadataGlobalizationTest : Page
+	{
+		// #2815: generic type parameter are not prefixed with `global::` during BindableTypeProvidersSourceGenerator
+		// which causes CS0234, "type or namespace name X not found in Y", in some case like here.
+		// the BindableMetadata are generated with a RootNamespace `SamplesApp.${platform}`, and
+		// `UITests.Xaml_CodeGen.TestAsd` is then resolved to `SamplesApp.UITests.Xaml_CodeGen.TestAsd`
+		// since `SamplesApp.UITests` has a higher precedence than `global::UITests`, even if `Xaml_CodeGen` is not declared there.
+		public IEnumerable<TestAsd> MyProperty { get; set; }
+
+		public BindableMetadataGlobalizationTest()
+		{
+			this.InitializeComponent();
+		}
+	}
+
+	public class TestAsd { }
+}

src/SourceGenerators/Uno.UI.SourceGenerators/BindableTypeProviders/BindableTypeProvidersGenerationTask.cs

@@ -387,7 +387,7 @@ where field.IsStatic
 
 					foreach (var property in properties)
 					{
-						var propertyTypeName = GetGlobalQualifier(property.Type) + SanitizeTypeName(property.Type.ToString());
+						var propertyTypeName = property.Type.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat);
 						var propertyName = property.Name;
 
 						if (IsStringIndexer(property))