PhotonNetwork.InternalCleanPhotonMonoFromSceneIfStuck C# (CSharp) Method

    public static void InternalCleanPhotonMonoFromSceneIfStuck()
    {
        PhotonHandler[] photonHandlers = GameObject.FindObjectsOfType(typeof(PhotonHandler)) as PhotonHandler[];
        if (photonHandlers != null && photonHandlers.Length > 0)
        {
            Debug.Log("Cleaning up hidden PhotonHandler instances in scene. Please save it. This is not an issue.");
            foreach (PhotonHandler photonHandler in photonHandlers)
            {
                // Debug.Log("Removing Handler: " + photonHandler + " photonHandler.gameObject: " + photonHandler.gameObject);
                photonHandler.gameObject.hideFlags = 0;

                if (photonHandler.gameObject != null && photonHandler.gameObject.name == "PhotonMono")
                {
                    GameObject.DestroyImmediate(photonHandler.gameObject);
                }

                Component.DestroyImmediate(photonHandler);
            }
        }
    }

    // this method corrects the IDs for photonviews in the scene and in prefabs
    // make sure prefabs always use viewID 0
    // make sure instances never use a owner
    // this is a editor class that should only run if not playing
    internal static void HierarchyChange()
    {
        if (Application.isPlaying)
        {
            //Debug.Log("HierarchyChange ignored, while running.");
            CheckSceneForStuckHandlers = true;
            return;
        }

        if (CheckSceneForStuckHandlers)
        {
            CheckSceneForStuckHandlers = false;
            PhotonNetwork.InternalCleanPhotonMonoFromSceneIfStuck();
        }

        HashSet <PhotonView> pvInstances             = new HashSet <PhotonView>();
        HashSet <int>        usedInstanceViewNumbers = new HashSet <int>();
        bool fixedSomeId = false;

        //// the following code would be an option if we only checked scene objects (but we can check all PVs)
        //PhotonView[] pvObjects = GameObject.FindSceneObjectsOfType(typeof(PhotonView)) as PhotonView[];
        //Debug.Log("HierarchyChange. PV Count: " + pvObjects.Length);


        int minViewIdInThisScene = PunSceneSettings.MinViewIdForScene(Application.loadedLevelName);

        //Debug.Log("Level '" + Application.loadedLevelName + "' has a minimum ViewId of: " + minViewIdInThisScene);

        PhotonView[] pvObjects = Resources.FindObjectsOfTypeAll(typeof(PhotonView)) as PhotonView[];
        foreach (PhotonView view in pvObjects)
        {
            // first pass: fix prefabs to viewID 0 if they got a view number assigned (cause they should not have one!)
            if (EditorUtility.IsPersistent(view.gameObject))
            {
                if (view.viewID != 0 || view.prefixBackup != -1)
                {
                    Debug.LogWarning("PhotonView on persistent object being fixed (id and prefix must be 0). Was: " + view);
                    view.viewID       = 0;
                    view.prefixBackup = -1;
                    EditorUtility.SetDirty(view);
                    fixedSomeId = true;
                }
            }
            else
            {
                // keep all scene-instanced PVs for later re-check
                pvInstances.Add(view);
            }
        }

        // second pass: check all used-in-scene viewIDs for duplicate viewIDs (only checking anything non-prefab)
        // scene-PVs must have user == 0 (scene/room) and a subId != 0
        foreach (PhotonView view in pvInstances)
        {
            if (view.ownerId > 0)
            {
                Debug.Log("Re-Setting Owner ID of: " + view);
            }
            view.ownerId = 0;   // simply make sure no owner is set (cause room always uses 0)
            view.prefix  = -1;  // TODO: prefix could be settable via inspector per scene?!

            if (view.subId != 0)
            {
                if (view.subId < minViewIdInThisScene || usedInstanceViewNumbers.Contains(view.subId))
                {
                    view.subId = 0; // avoid duplicates and negative values by assigning 0 as (temporary) number to be fixed in next pass
                }
                else
                {
                    usedInstanceViewNumbers.Add(view.subId); // builds a list of currently used viewIDs
                }
            }
        }

        // third pass: anything that's now 0 must get a new (not yet used) subId number
        int lastUsedId = minViewIdInThisScene - 1;

        foreach (PhotonView view in pvInstances)
        {
            if (view.subId == 0)
            {
                // Debug.LogWarning("setting scene ID: " + view.gameObject.name + " ID: " + view.subId.ID + " scene ID: " + view.GetSceneID() + " IsPersistent: " + EditorUtility.IsPersistent(view.gameObject) + " IsSceneViewIDFree: " + IsSceneViewIDFree(view.subId.ID, view));
                view.subId = PhotonViewHandler.GetID(lastUsedId, usedInstanceViewNumbers);
                lastUsedId = view.subId;

                //// when using the Editor's serialization (view.subId in this case), this is not needed, it seems
                //PrefabUtility.RecordPrefabInstancePropertyModifications(view);

                EditorUtility.SetDirty(view);
                fixedSomeId = true;
            }
        }

        if (fixedSomeId)
        {
            //Debug.LogWarning("Some subId was adjusted."); // this log is only interesting for Exit Games
        }
    }