Fixes #7309 - Each time we retrieve a null *PlatformOptions from AvaloniaLocator, return a default instance

src/Avalonia.Native/AvaloniaNativeMenuExporter.cs

@@ -80,8 +80,8 @@ namespace Avalonia.Native
             };
             result.Add(aboutItem);
 
-            var macOpts = AvaloniaLocator.Current.GetService<MacOSPlatformOptions>();
+            var macOpts = AvaloniaLocator.Current.GetService<MacOSPlatformOptions>() ?? new MacOSPlatformOptions();
-            if (macOpts == null || !macOpts.DisableDefaultApplicationMenuItems)
+            if (!macOpts.DisableDefaultApplicationMenuItems)
             {
                 result.Add(new NativeMenuItemSeparator());
 
@@ -142,9 +142,9 @@ namespace Avalonia.Native
 
         private void DoLayoutReset(bool forceUpdate = false)
         {
-            var macOpts = AvaloniaLocator.Current.GetService<MacOSPlatformOptions>();
+            var macOpts = AvaloniaLocator.Current.GetService<MacOSPlatformOptions>() ?? new MacOSPlatformOptions();
 
-            if (macOpts != null && macOpts.DisableNativeMenus)
+            if (macOpts.DisableNativeMenus)
             {
                 return;
             }

src/Avalonia.Native/AvaloniaNativePlatform.cs

@@ -96,9 +96,9 @@ namespace Avalonia.Native
             _factory.Initialize(new GCHandleDeallocator(), applicationPlatform);
             if (_factory.MacOptions != null)
             {
-                var macOpts = AvaloniaLocator.Current.GetService<MacOSPlatformOptions>();
+                var macOpts = AvaloniaLocator.Current.GetService<MacOSPlatformOptions>() ?? new MacOSPlatformOptions();
 
-                _factory.MacOptions.SetShowInDock(macOpts?.ShowInDock != false ? 1 : 0);
+                _factory.MacOptions.SetShowInDock(macOpts.ShowInDock ? 1 : 0);
             }
 
             AvaloniaLocator.CurrentMutable

src/Avalonia.X11/Glx/GlxDisplay.cs

@@ -95,8 +95,8 @@ namespace Avalonia.X11.Glx
 
                 if (Environment.GetEnvironmentVariable("AVALONIA_GLX_IGNORE_RENDERER_BLACKLIST") != "1")
                 {
-                    var blacklist = AvaloniaLocator.Current.GetService<X11PlatformOptions>()
+                    var opts = AvaloniaLocator.Current.GetService<X11PlatformOptions>() ?? new X11PlatformOptions();
-                        ?.GlxRendererBlacklist;
+                    var blacklist = opts.GlxRendererBlacklist;
                     if (blacklist != null)
                         foreach (var item in blacklist)
                             if (glInterface.Renderer.Contains(item))

src/Linux/Avalonia.LinuxFramebuffer/LinuxFramebufferPlatform.cs

@@ -38,11 +38,11 @@ namespace Avalonia.LinuxFramebuffer
             if (_fb is IGlOutputBackend gl)
                 AvaloniaLocator.CurrentMutable.Bind<IPlatformOpenGlInterface>().ToConstant(gl.PlatformOpenGlInterface);
             
-            var opts = AvaloniaLocator.Current.GetService<LinuxFramebufferPlatformOptions>();
+            var opts = AvaloniaLocator.Current.GetService<LinuxFramebufferPlatformOptions>() ?? new LinuxFramebufferPlatformOptions();
             
             AvaloniaLocator.CurrentMutable
                 .Bind<IPlatformThreadingInterface>().ToConstant(Threading)
-                .Bind<IRenderTimer>().ToConstant(new DefaultRenderTimer(opts?.Fps ?? 60))
+                .Bind<IRenderTimer>().ToConstant(new DefaultRenderTimer(opts.Fps))
                 .Bind<IRenderLoop>().ToConstant(new RenderLoop())
                 .Bind<ICursorFactory>().ToTransient<CursorFactoryStub>()
                 .Bind<IKeyboardDevice>().ToConstant(new KeyboardDevice())

src/Windows/Avalonia.Win32/Win32GlManager.cs

@@ -13,19 +13,18 @@ namespace Avalonia.Win32
         {
             AvaloniaLocator.CurrentMutable.Bind<IPlatformOpenGlInterface>().ToLazy<IPlatformOpenGlInterface>(() =>
             {
-                var opts = AvaloniaLocator.Current.GetService<Win32PlatformOptions>();
+                var opts = AvaloniaLocator.Current.GetService<Win32PlatformOptions>() ?? new Win32PlatformOptions();
-                if (opts?.UseWgl == true)
+                if (opts.UseWgl)
                 {
                     var wgl = WglPlatformOpenGlInterface.TryCreate();
                     return wgl;
                 }
 
-                if (opts?.AllowEglInitialization ?? Win32Platform.WindowsVersion > PlatformConstants.Windows7)
+                if (opts.AllowEglInitialization ?? Win32Platform.WindowsVersion > PlatformConstants.Windows7)
                 {
                     var egl = EglPlatformOpenGlInterface.TryCreate(() => new AngleWin32EglDisplay());
 
-                    if (egl != null &&
+                    if (egl != null && opts.UseWindowsUIComposition)
-                        opts?.UseWindowsUIComposition == true)
                     {
                         WinUICompositorConnection.TryCreateAndRegister(egl, opts.CompositionBackdropCornerRadius);
                     }