Seal/abstract/virtual everything (#6739)

Content.Client/ContextMenu/UI/ContextMenuElement.xaml.cs

@@ -15,6 +15,7 @@ namespace Content.Client.ContextMenu.UI
     ///     If this entry has a sub-menu, it also shows a little ">" icon on the right.
     /// </summary>
     [GenerateTypedNameReferences]
+    [Virtual]
     public partial class ContextMenuElement : ContainerButton
     {
         public const string StyleClassContextMenuButton = "contextMenuButton";

Content.Client/ContextMenu/UI/ContextMenuPopup.xaml.cs

@@ -12,7 +12,7 @@ namespace Content.Client.ContextMenu.UI
     ///     The base context-menu pop-up window used for both the entity and verb menus.
     /// </summary>
     [GenerateTypedNameReferences]
-    public partial class ContextMenuPopup : Popup
+    public sealed partial class ContextMenuPopup : Popup
     {
         public const string StyleClassContextMenuPopup = "contextMenuPopup";
 
@@ -52,7 +52,7 @@ namespace Content.Client.ContextMenu.UI
 
             UserInterfaceManager.ModalRoot.AddChild(this);
             MenuBody.OnChildRemoved += ctrl => _presenter.OnRemoveElement(this, ctrl);
-            
+
             if (ParentElement != null)
             {
                 DebugTools.Assert(ParentElement.SubMenu == null);

Content.Client/ContextMenu/UI/ContextMenuPresenter.cs

@@ -13,6 +13,7 @@ namespace Content.Client.ContextMenu.UI
     /// <remarks>
     ///     This largely involves setting up timers to open and close sub-menus when hovering over other menu elements.
     /// </remarks>
+    [Virtual]
     public class ContextMenuPresenter : IDisposable
     {
         public static readonly TimeSpan HoverDelay = TimeSpan.FromSeconds(0.2);
@@ -179,7 +180,7 @@ namespace Content.Client.ContextMenu.UI
         }
 
         /// <summary>
-        ///     Removes event subscriptions when an element is removed from a menu, 
+        ///     Removes event subscriptions when an element is removed from a menu,
         /// </summary>
         public void OnRemoveElement(ContextMenuPopup menu, Control control)
         {

Content.Client/ContextMenu/UI/EntityMenuElement.cs

@@ -6,7 +6,7 @@ using Robust.Shared.Maths;
 
 namespace Content.Client.ContextMenu.UI
 {
-    public partial class EntityMenuElement : ContextMenuElement
+    public sealed partial class EntityMenuElement : ContextMenuElement
     {
         public const string StyleClassEntityMenuCountText = "contextMenuCount";