private List<M> findCallers() {
    if (getMember() == null) return Collections.emptyList();
    final Ref<List<M>> callers = new Ref<>();
    if (!ProgressManager.getInstance().runProcessWithProgressSynchronously(() -> ApplicationManager.getApplication().runReadAction(() -> callers.set(ContainerUtil.filter(computeCallers(), getFilter()))), RefactoringBundle.message("caller.chooser.looking.for.callers"), true, myProject)) {
      myCancelCallback.run();
      return Collections.emptyList();
    }
    return callers.get();
  }
private List<M> findCallers()