private static void appendFieldValue(@NotNull MoreObjects.ToStringHelper h,
                                       @NotNull GridBagConstraints constraints,
                                       @NotNull String field) {
    Object value = ReflectionUtil.getField(GridBagConstraints.class, constraints, null, field);
    Object defaultValue = ReflectionUtil.getField(GridBagConstraints.class, new GridBagConstraints(), null, field);
    if (!Comparing.equal(value, defaultValue)) h.add(field, value);
  }
private static void appendFieldValue(@NotNull MoreObjects.ToStringHelper h,
                                       @NotNull GridBagConstraints constraints,
                                       @NotNull String field)