public static void addClassToPermitsList(@NotNull PsiClass psiClass, @NotNull String fqn) {
    Set<String> missingInheritors = new HashSet<>();
    missingInheritors.add(fqn);
    if (psiClass.getPermitsList() == null) {
      missingInheritors.addAll(findSameFileInheritors(psiClass));
    }
    fillPermitsList(psiClass, missingInheritors);
  }
public static void addClassToPermitsList(@NotNull PsiClass psiClass, @NotNull String fqn)