feat(Native): Address rule CA1822

src/Avalonia.Native/AvaloniaNativeDragSource.cs

@@ -19,8 +19,8 @@ namespace Avalonia.Native
         {
             _factory = factory;
         }
-        
+
-        TopLevel FindRoot(IInteractive interactive)
+        static TopLevel FindRoot(IInteractive interactive)
         {
             while (interactive != null && !(interactive is IVisual))
                 interactive = interactive.InteractiveParent;
@@ -48,7 +48,7 @@ namespace Avalonia.Native
         public Task<DragDropEffects> DoDragDrop(PointerEventArgs triggerEvent, IDataObject data, DragDropEffects allowedEffects)
         {
             // Sanity check
-            var tl = FindRoot(triggerEvent.Source);
+            var tl = AvaloniaNativeDragSource.FindRoot(triggerEvent.Source);
             var view = tl?.PlatformImpl as WindowBaseImpl;
             if (view == null)
                 throw new ArgumentException();

src/Avalonia.Native/AvaloniaNativeMenuExporter.cs

@@ -65,7 +65,7 @@ namespace Avalonia.Native
             }
         }
 
-        private NativeMenu CreateDefaultAppMenu()
+        private static NativeMenu CreateDefaultAppMenu()
         {
             var result = new NativeMenu();
 
@@ -167,7 +167,7 @@ namespace Avalonia.Native
 
                         if (appMenu == null)
                         {
-                            appMenu = CreateDefaultAppMenu();
+                            appMenu = AvaloniaNativeMenuExporter.CreateDefaultAppMenu();
                             NativeMenu.SetMenu(Application.Current, appMenu);
                         }
 

src/Avalonia.Native/IAvnMenu.cs

@@ -111,7 +111,7 @@ namespace Avalonia.Native.Interop.Impl
 
         private __MicroComIAvnMenuItemProxy CreateNewAt(IAvaloniaNativeFactory factory, int index, NativeMenuItemBase item)
         {
-            var result = CreateNew(factory, item);
+            var result = __MicroComIAvnMenuProxy.CreateNew(factory, item);
 
             result.Initialize(item);
 
@@ -123,7 +123,7 @@ namespace Avalonia.Native.Interop.Impl
             return result;
         }
 
-        private __MicroComIAvnMenuItemProxy CreateNew(IAvaloniaNativeFactory factory, NativeMenuItemBase item)
+        private static __MicroComIAvnMenuItemProxy CreateNew(IAvaloniaNativeFactory factory, NativeMenuItemBase item)
         {
             var nativeItem = (__MicroComIAvnMenuItemProxy)(item is NativeMenuItemSeparator ?
                 factory.CreateMenuItemSeparator() :