From 54dd8a4002cb15dc02841b6593a57785674642e4 Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Wed, 18 Sep 2019 16:43:42 +0100
Subject: [PATCH] add implementation for osx.

---
 src/Avalonia.Native/WindowImplBase.cs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/Avalonia.Native/WindowImplBase.cs b/src/Avalonia.Native/WindowImplBase.cs
index 217fb4b078..05068a275f 100644
--- a/src/Avalonia.Native/WindowImplBase.cs
+++ b/src/Avalonia.Native/WindowImplBase.cs
@@ -3,6 +3,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using Avalonia.Controls;
 using Avalonia.Controls.Platform.Surfaces;
 using Avalonia.Input;
@@ -48,6 +49,11 @@ namespace Avalonia.Native
             Screen = new ScreenImpl(screens);
             _savedLogicalSize = ClientSize;
             _savedScaling = Scaling;
+
+            var monitor = Screen.AllScreens.OrderBy(x => x.PixelDensity)
+                    .FirstOrDefault(m => m.Bounds.Contains(Position));
+
+            Resize(new Size(monitor.WorkingArea.Width * 0.75d, monitor.WorkingArea.Height * 0.7d);
         }
 
         public Size ClientSize