From d92bf1d97e93dccbcf2f4fae88a31d7956fba701 Mon Sep 17 00:00:00 2001
From: Matt Lacey <matt@mrlacey.co.uk>
Date: Mon, 3 Nov 2025 15:44:45 +0000
Subject: [PATCH] Don't let the PreviewerWindow grow without limit (#19957)

---
 src/Avalonia.DesignerSupport/Remote/PreviewerWindowImpl.cs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/Avalonia.DesignerSupport/Remote/PreviewerWindowImpl.cs b/src/Avalonia.DesignerSupport/Remote/PreviewerWindowImpl.cs
index 61924f53ab..7733bcd4ff 100644
--- a/src/Avalonia.DesignerSupport/Remote/PreviewerWindowImpl.cs
+++ b/src/Avalonia.DesignerSupport/Remote/PreviewerWindowImpl.cs
@@ -64,6 +64,12 @@ namespace Avalonia.DesignerSupport.Remote
         
         public void Resize(Size clientSize, WindowResizeReason reason)
         {
+            // Don't let it clientSize be unconstrained or risk running Out Of Memory 
+            clientSize = new Size(
+                Math.Min(clientSize.Width, MaxAutoSizeHint.Width),
+                Math.Min(clientSize.Height, MaxAutoSizeHint.Height)
+            );
+
             _transport.Send(new RequestViewportResizeMessage
             {
                 Width = Math.Ceiling(clientSize.Width * RenderScaling),