From ca305adea0e26b5d94a2f16d575b6952735b4e20 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Mon, 4 Jul 2016 21:20:06 +0200
Subject: [PATCH] Don't send resize message on minimize.

Fixes #571.
---
 src/Windows/Avalonia.Win32/Interop/UnmanagedMethods.cs | 9 +++++++++
 src/Windows/Avalonia.Win32/WindowImpl.cs               | 4 +++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/Windows/Avalonia.Win32/Interop/UnmanagedMethods.cs b/src/Windows/Avalonia.Win32/Interop/UnmanagedMethods.cs
index 141c2e4653..6635882d4a 100644
--- a/src/Windows/Avalonia.Win32/Interop/UnmanagedMethods.cs
+++ b/src/Windows/Avalonia.Win32/Interop/UnmanagedMethods.cs
@@ -75,6 +75,15 @@ namespace Avalonia.Win32.Interop
             SWP_RESIZE = SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOZORDER
         }
 
+        public enum SizeCommand
+        {
+            Restored,
+            Minimized,
+            Maximized,
+            MaxShow,
+            MaxHide,
+        }
+
         public enum ShowWindowCommand
         {
             Hide = 0,
diff --git a/src/Windows/Avalonia.Win32/WindowImpl.cs b/src/Windows/Avalonia.Win32/WindowImpl.cs
index 08076cee52..55c6048b1f 100644
--- a/src/Windows/Avalonia.Win32/WindowImpl.cs
+++ b/src/Windows/Avalonia.Win32/WindowImpl.cs
@@ -552,7 +552,9 @@ namespace Avalonia.Win32
                     return IntPtr.Zero;
 
                 case UnmanagedMethods.WindowsMessage.WM_SIZE:
-                    if (Resized != null)
+                    if (Resized != null &&
+                        (wParam == (IntPtr)UnmanagedMethods.SizeCommand.Restored ||
+                         wParam == (IntPtr)UnmanagedMethods.SizeCommand.Maximized))
                     {
                         var clientSize = new Size((int)lParam & 0xffff, (int)lParam >> 16);
                         Resized(clientSize / Scaling);