From 83df61018f2daac10661475227f834ea965783fb Mon Sep 17 00:00:00 2001
From: GogoVega <92022724+GogoVega@users.noreply.github.com>
Date: Mon, 22 Sep 2025 09:53:09 +0200
Subject: [PATCH 1/2] Fix undo node output changes inside a Subflow

---
 .../node_modules/@node-red/editor-client/src/js/ui/editor.js    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js b/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js
index 70963e389..f804e6de2 100644
--- a/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js
+++ b/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js
@@ -1179,7 +1179,7 @@ RED.editor = (function() {
                             if (editState.outputMap) {
                                 historyEvent.outputMap = editState.outputMap;
                             }
-                            if (subflowInstances) {
+                            if (subflowInstances && subflowInstances.length) {
                                 historyEvent.subflow = {
                                     instances:subflowInstances
                                 }

From cad105bbd1703a647a28cfa0d2b65a5d39840019 Mon Sep 17 00:00:00 2001
From: GogoVega <92022724+GogoVega@users.noreply.github.com>
Date: Mon, 22 Sep 2025 10:33:22 +0200
Subject: [PATCH 2/2] Fix undo node output changes if instances exist

---
 .../@node-red/editor-client/src/js/history.js | 27 ++++++++++---------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/packages/node_modules/@node-red/editor-client/src/js/history.js b/packages/node_modules/@node-red/editor-client/src/js/history.js
index 8b9601fa6..142606822 100644
--- a/packages/node_modules/@node-red/editor-client/src/js/history.js
+++ b/packages/node_modules/@node-red/editor-client/src/js/history.js
@@ -582,22 +582,23 @@ RED.history = (function() {
                         RED.editor.updateNodeProperties(n);
                         RED.editor.validateNode(n);
                     });
-                } else {
-                    var outputMap;
-                    if (ev.outputMap) {
-                        outputMap = {};
-                        inverseEv.outputMap = {};
-                        for (var port in ev.outputMap) {
-                            if (ev.outputMap.hasOwnProperty(port) && ev.outputMap[port] !== "-1") {
-                                outputMap[ev.outputMap[port]] = port;
-                                inverseEv.outputMap[ev.outputMap[port]] = port;
-                            }
+                }
+
+                let outputMap;
+                if (ev.outputMap) {
+                    outputMap = {};
+                    inverseEv.outputMap = {};
+                    for (var port in ev.outputMap) {
+                        if (ev.outputMap.hasOwnProperty(port) && ev.outputMap[port] !== "-1") {
+                            outputMap[ev.outputMap[port]] = port;
+                            inverseEv.outputMap[ev.outputMap[port]] = port;
                         }
                     }
-                    ev.node.__outputs = inverseEv.changes.outputs;
-                    RED.editor.updateNodeProperties(ev.node,outputMap);
-                    RED.editor.validateNode(ev.node);
                 }
+                ev.node.__outputs = inverseEv.changes.outputs;
+                RED.editor.updateNodeProperties(ev.node,outputMap);
+                RED.editor.validateNode(ev.node);
+
                 // If it's a Config Node, validate user nodes too.
                 // NOTE: The Config Node must be validated before validating users.
                 if (ev.node.users) {