@Nullable
  static String getPropertyUnescapedKey(@NotNull TreeElement element) {
    if (!(element instanceof StructureViewTreeElement)) {
      return null;
    }
    Object value = ((StructureViewTreeElement)element).getValue();
    if (!(value instanceof IProperty)) {
      return null;
    }
    return ((IProperty) value).getUnescapedKey();
  }
@Nullable
  static String getPropertyUnescapedKey(@NotNull TreeElement element)