From 299d0493b92469818cbb31950aa41164b4acc6ce Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Thu, 12 Aug 2021 11:48:36 +0200
Subject: [PATCH] Optimize single undo edit action to not use wrapper

---
 Source/Editor/Undo/Undo.cs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Source/Editor/Undo/Undo.cs b/Source/Editor/Undo/Undo.cs
index 709e21a32..80a5d69a3 100644
--- a/Source/Editor/Undo/Undo.cs
+++ b/Source/Editor/Undo/Undo.cs
@@ -221,16 +221,20 @@ namespace FlaxEditor
                 var snapshotInstances = (object[])snapshotInstance;
                 if (snapshotInstances == null || snapshotInstances.Length != SnapshotInstances.Length)
                     throw new ArgumentException("Invalid multi undo action objects.");
-                var actions = new List<UndoActionObject>();
+                List<UndoActionObject> actions = null;
                 for (int i = 0; i < snapshotInstances.Length; i++)
                 {
                     var diff = Snapshot[i].Compare(snapshotInstances[i]);
                     if (diff.Count == 0)
                         continue;
+                    if (actions == null)
+                        actions = new List<UndoActionObject>();
                     actions.Add(new UndoActionObject(diff, ActionString, SnapshotInstances[i]));
                 }
-                if (actions.Count == 0)
+                if (actions == null)
                     return null;
+                if (actions.Count == 1)
+                    return actions[0];
                 return new MultiUndoAction(actions);
             }
         }