private boolean isUsedInTarget(PsiDirectory directory) {
    PsiDirectory targetDirectory = myNestedDirsToMove.get(directory).getTargetDirectory();
    //don't delete super directory if move was performed inside subpackage
    if (targetDirectory != null && PsiTreeUtil.isAncestor(directory, targetDirectory, false)) {
      return true;
    }
    //don't delete subdirectory: something could be moved in there
    if (PsiTreeUtil.isAncestor(targetDirectory, directory, false)) {
      return true;
    }

    return false;
  }
private boolean isUsedInTarget(PsiDirectory directory)