Initial WinUI switch.

Wino.Mail.WinUI/Selectors/AccountProviderViewModelTemplateSelector.cs

@@ -0,0 +1,19 @@
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Wino.Core.ViewModels.Data;
+
+namespace Wino.Selectors;
+
+public partial class AccountProviderViewModelTemplateSelector : DataTemplateSelector
+{
+    public DataTemplate RootAccountTemplate { get; set; }
+    public DataTemplate MergedAccountTemplate { get; set; }
+
+    protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
+    {
+        if (item is MergedAccountProviderDetailViewModel)
+            return MergedAccountTemplate;
+        else
+            return RootAccountTemplate;
+    }
+}