From 9d9d58259886247f6b482bfb859aa00fc1f791ca Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Wed, 1 Apr 2026 09:50:02 +0200
Subject: [PATCH] Add undo to preserve connections when changing parameter in
 param node

---
 Source/Editor/Surface/Archetypes/Parameters.cs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Source/Editor/Surface/Archetypes/Parameters.cs b/Source/Editor/Surface/Archetypes/Parameters.cs
index 905f793c9..61d3b3617 100644
--- a/Source/Editor/Surface/Archetypes/Parameters.cs
+++ b/Source/Editor/Surface/Archetypes/Parameters.cs
@@ -13,6 +13,7 @@ using FlaxEditor.Scripting;
 using FlaxEditor.Surface.Elements;
 using FlaxEngine;
 using FlaxEngine.Utilities;
+using FlaxEditor.Surface.Undo;
 
 namespace FlaxEditor.Surface.Archetypes
 {
@@ -92,7 +93,17 @@ namespace FlaxEditor.Surface.Archetypes
                 var selected = GetSelected();
                 var selectedID = selected?.ID ?? Guid.Empty;
                 if (selectedID != (Guid)Values[0])
+                {
+                    if (Surface.Undo != null && Surface.Undo.Enabled)
+                    {
+                        // Capture node connections to support undo
+                        var action = new EditNodeConnections(Context, this);
+                        RemoveConnections();
+                        action.End();
+                        Surface.AddBatchedUndoAction(action);
+                    }
                     Set(selected, ref selectedID);
+                }
             }
 
             /// <summary>