Hide GetWindowState from avn.idl because it returns something random

native/Avalonia.Native/src/OSX/WindowImpl.h

@@ -56,7 +56,7 @@ BEGIN_INTERFACE_MAP()
 
     virtual HRESULT SetTitleBarColor(AvnColor color) override;
 
-    virtual HRESULT GetWindowState (AvnWindowState*ret) override;
+    virtual HRESULT GetWindowState (AvnWindowState*ret);
 
     virtual HRESULT TakeFocusFromChildren () override;
 

src/Avalonia.Native/WindowImpl.cs

@@ -20,6 +20,7 @@ namespace Avalonia.Native
         private readonly ITopLevelNativeMenuExporter _nativeMenuExporter;
         private bool _canResize = true;
         private bool _canMaximize = true;
+        private WindowState _windowState;
         private Controls.WindowDecorations _decorations = Controls.WindowDecorations.Full;
 
         internal WindowImpl(IAvaloniaNativeFactory factory, AvaloniaNativePlatformOptions opts) : base(factory)
@@ -61,6 +62,7 @@ namespace Avalonia.Native
 
             void IAvnWindowEvents.WindowStateChanged(AvnWindowState state)
             {
+                _parent._windowState = (WindowState)state;
                 _parent.InvalidateExtendedMargins();
 
                 _parent.WindowStateChanged?.Invoke((WindowState)state);
@@ -110,7 +112,7 @@ namespace Avalonia.Native
 
         public WindowState WindowState
         {
-            get => (WindowState)_native.WindowState;
+            get => _windowState;
             set => _native.SetWindowState((AvnWindowState)value);
         }
 

src/Avalonia.Native/avn.idl

@@ -798,7 +798,6 @@ interface IAvnWindow : IAvnWindowBase
      HRESULT SetTitle(char* utf8Title);
      HRESULT SetTitleBarColor(AvnColor color);
      HRESULT SetWindowState(AvnWindowState state);
-     HRESULT GetWindowState(AvnWindowState*ret);
      HRESULT TakeFocusFromChildren();
      HRESULT SetExtendClientArea(bool enable);
      HRESULT GetExtendTitleBarHeight(double*ret);