From a24eb02876715a0a604379c7b679f04ea58668a2 Mon Sep 17 00:00:00 2001
From: "Alex A. Naanou" <alex.nanou@gmail.com>
Date: Mon, 30 Oct 2023 02:56:03 +0300
Subject: [PATCH] node merging undo can merge merged sets...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
---
 experiments/outline-editor/editor.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/experiments/outline-editor/editor.js b/experiments/outline-editor/editor.js
index 00b88ce..643db70 100755
--- a/experiments/outline-editor/editor.js
+++ b/experiments/outline-editor/editor.js
@@ -1259,7 +1259,12 @@ var Outline = {
 		if(stack == null || stack.length == 0){
 			return this }
 		stack.push(
-			stack.splice(-n, n))
+			stack.splice(-n, n)
+				.map(function(e){
+					return typeof(e[1]) == 'string' ?
+						[e]
+						: e })
+				.flat())
 		return this },
 	clearUndo: function(){
 		this.__undo_stack = undefined