Unify editor scene edit history

editor/app/Services/Scene/EngineEditorSceneBackend.cpp

@@ -2196,6 +2196,32 @@ public:
         return ResolvePrimaryScene(m_sceneManager);
     }
 
+    std::string CaptureActiveSceneSnapshot() const override {
+        Scene* scene = ResolvePrimaryScene(m_sceneManager);
+        return scene != nullptr
+            ? scene->SerializeToString()
+            : std::string();
+    }
+
+    bool RestoreActiveSceneSnapshot(const std::string& snapshot) override {
+        if (snapshot.empty()) {
+            return false;
+        }
+
+        Scene* scene = ResolvePrimaryScene(m_sceneManager);
+        if (scene == nullptr) {
+            return false;
+        }
+
+        {
+            ResourceManager::ScopedDeferredSceneLoad deferredSceneLoad(
+                m_resourceManager);
+            scene->DeserializeFromString(snapshot);
+        }
+        m_sceneManager.SetActiveScene(scene);
+        return true;
+    }
+
     std::unique_ptr<EditorScenePlaySession> BeginPlaySession() override {
         Scene* editScene = ResolvePrimaryScene(m_sceneManager);
         if (editScene == nullptr) {