@TestOnly
  public int getPointersNumber(@NotNull PsiFile containingFile) {
    VirtualFile file = containingFile.getViewProvider().getVirtualFile();
    SmartPointerTracker pointers = getTracker(file);
    return pointers == null ? 0 : pointers.getSize();
  }
@TestOnly
  public int getPointersNumber(@NotNull PsiFile containingFile)