public @NotNull @NlsSafe String getDisplayName() {
      final NamedConfigurable configurable = (NamedConfigurable)getUserObject();
      if (configurable != null) return configurable.getDisplayName();
      LOG.debug("Tree was already disposed"); // workaround for IDEA-206547
      return "DISPOSED";
    }
public @NotNull @NlsSafe String getDisplayName()