Revert "File scoped namespaces"

This reverts commit d31d8f574e.

Wino.Mail.ViewModels/Messages/ActiveMailItemChangedEvent.cs

@@ -1,17 +1,18 @@
 using Wino.Mail.ViewModels.Data;
 
-namespace Wino.Mail.ViewModels.Messages;
-
-/// <summary>
-/// When active mail item in the reader is updated.
-/// </summary>
-public class ActiveMailItemChangedEvent
+namespace Wino.Mail.ViewModels.Messages
 {
-    public ActiveMailItemChangedEvent(MailItemViewModel selectedMailItemViewModel)
+    /// <summary>
+    /// When active mail item in the reader is updated.
+    /// </summary>
+    public class ActiveMailItemChangedEvent
     {
-        // SelectedMailItemViewModel can be null.
-        SelectedMailItemViewModel = selectedMailItemViewModel;
-    }
+        public ActiveMailItemChangedEvent(MailItemViewModel selectedMailItemViewModel)
+        {
+            // SelectedMailItemViewModel can be null.
+            SelectedMailItemViewModel = selectedMailItemViewModel;
+        }
 
-    public MailItemViewModel SelectedMailItemViewModel { get; set; }
+        public MailItemViewModel SelectedMailItemViewModel { get; set; }
+    }
 }