private @NotNull SmartPointerTracker getOrCreateTracker(@NotNull VirtualFile file) {
    synchronized (myPhysicalTrackers) {
      SmartPointerTracker tracker = getTracker(file);
      if (tracker == null) {
        tracker = new SmartPointerTracker();
        if (file instanceof LightVirtualFile) {
          file.putUserData(LIGHT_TRACKER_KEY, new WeakReference<>(tracker));
        } else {
          myPhysicalTrackers.put(file, tracker);
        }
      }
      return tracker;
    }
  }
private @NotNull SmartPointerTracker getOrCreateTracker(@NotNull VirtualFile file)