Mac: Fix Eto invoker

NAPS2.Lib.Mac/EtoForms/Mac/MacEtoPlatform.cs

@@ -26,6 +26,20 @@ public class MacEtoPlatform : EtoPlatform
         return new Application(Platforms.macOS);
     }
 
+    public override void Invoke(Application application, Action action)
+    {
+        // TODO: Eto PR to use this instead of DispatchQueue.MainQueue
+        // Invoking directly on DispatchQueue ignores the run loop mode, which can mean something like spawning a modal
+        // form doesn't behave normally.
+        // https://stackoverflow.com/questions/9335434/whats-the-difference-between-performselectoronmainthread-and-dispatch-async
+        NSApplication.SharedApplication.InvokeOnMainThread(action);
+    }
+
+    public override void AsyncInvoke(Application application, Action action)
+    {
+        NSApplication.SharedApplication.BeginInvokeOnMainThread(action);
+    }
+
     public override IListView<T> CreateListView<T>(ListViewBehavior<T> behavior) =>
         new MacListView<T>(behavior);
 

NAPS2.Lib/EtoForms/EtoInvoker.cs

@@ -13,18 +13,18 @@ public class EtoInvoker : IInvoker
 
     public void Invoke(Action action)
     {
-        _application.Invoke(action);
+        EtoPlatform.Current.Invoke(_application, action);
     }
 
     public void InvokeDispatch(Action action)
     {
-        _application.AsyncInvoke(action);
+        EtoPlatform.Current.AsyncInvoke(_application, action);
     }
 
     public T InvokeGet<T>(Func<T> func)
     {
         T value = default!;
-        _application.Invoke(() => value = func());
+        EtoPlatform.Current.Invoke(_application, () => value = func());
         return value;
     }
 }

NAPS2.Lib/EtoForms/EtoPlatform.cs

@@ -48,6 +48,16 @@ public abstract class EtoPlatform
         application.Run();
     }
 
+    public virtual void Invoke(Application application, Action action)
+    {
+        application.Invoke(action);
+    }
+
+    public virtual void AsyncInvoke(Application application, Action action)
+    {
+        application.AsyncInvoke(action);
+    }
+
     public virtual void SetContainerSize(Window window, Control container, Size size, int padding)
     {
     }