@NotNull
  public TreeModelBuilder setLockedFolders(@Nullable List<? extends VirtualFile> lockedFolders) {
    assert myProject != null;
    if (ContainerUtil.isEmpty(lockedFolders)) return this;
    insertFilesIntoNode(lockedFolders, createLockedFolders(myProject));
    return this;
  }
@NotNull
  public TreeModelBuilder setLockedFolders(@Nullable List<? extends VirtualFile> lockedFolders)