fix: Uno UI registrations are not initialized (#3082)

* fix: Uno UI registrations are not initialized

* Update RegistrationNamespace.cs

* Update RegistrationNamespace.cs

Author: glennawatson

src/ReactiveUI.Tests/API/ApiApprovalTests.ReactiveUI.DotNet6_0.verified.txt

@@ -756,12 +756,13 @@ namespace ReactiveUI
         Winforms = 2,
         Wpf = 3,
         Uno = 4,
-        Blazor = 5,
-        Drawing = 6,
-        Avalonia = 7,
-        Maui = 8,
-        Uwp = 9,
-        WinUI = 10,
+        UnoWinUI = 5,
+        Blazor = 6,
+        Drawing = 7,
+        Avalonia = 8,
+        Maui = 9,
+        Uwp = 10,
+        WinUI = 11,
     }
     public class Registrations
     {

src/ReactiveUI.Tests/API/ApiApprovalTests.ReactiveUI.Net4_8.verified.txt

@@ -763,12 +763,13 @@ namespace ReactiveUI
         Winforms = 2,
         Wpf = 3,
         Uno = 4,
-        Blazor = 5,
-        Drawing = 6,
-        Avalonia = 7,
-        Maui = 8,
-        Uwp = 9,
-        WinUI = 10,
+        UnoWinUI = 5,
+        Blazor = 6,
+        Drawing = 7,
+        Avalonia = 8,
+        Maui = 9,
+        Uwp = 10,
+        WinUI = 11,
     }
     public class Registrations
     {

src/ReactiveUI/Mixins/DependencyResolverMixins.cs

@@ -44,6 +44,7 @@ public static void InitializeReactiveUI(this IMutableDependencyResolver resolver
             { RegistrationNamespace.Winforms, "ReactiveUI.Winforms" },
             { RegistrationNamespace.Wpf, "ReactiveUI.Wpf" },
             { RegistrationNamespace.Uno, "ReactiveUI.Uno" },
+            { RegistrationNamespace.UnoWinUI, "ReactiveUI.Uno.WinUI" },
             { RegistrationNamespace.Blazor, "ReactiveUI.Blazor" },
             { RegistrationNamespace.Drawing, "ReactiveUI.Drawing" },
             { RegistrationNamespace.Maui, "ReactiveUI.Maui" },
@@ -153,4 +154,4 @@ private static void ProcessRegistrationForNamespace(string namespaceName, Assemb
             }
         }
     }
-}
+}

src/ReactiveUI/RegistrationNamespace.cs

@@ -33,6 +33,11 @@ public enum RegistrationNamespace
     /// </summary>
     Uno,
 
+    /// <summary>
+    /// Uno Win UI.
+    /// </summary>
+    UnoWinUI,
+
     /// <summary>
     /// Blazor.
     /// </summary>
@@ -62,4 +67,4 @@ public enum RegistrationNamespace
     /// WinUI.
     /// </summary>
     WinUI,
-}
+}