static @NotNull Icon getSeqItemIcon(@Nullable YAMLValue itemValue) {
    if (itemValue instanceof YAMLScalar) {
      return PlatformIcons.PROPERTY_ICON;
    }
    else if (itemValue instanceof YAMLAlias) {
      return ALIAS_ICON;
    }
    else {
      return PlatformIcons.XML_TAG_ICON;
    }
  }
static @NotNull Icon getSeqItemIcon(@Nullable YAMLValue itemValue)