props_ordered does not work for nested fields

[0xDAFE]

Hi everyone,

We are using marshmallow-jsonschema to generate a JSON schema for json-editor.
I noticed that the recently introduced props_ordered argument does not work for nested schemas.

Extended Test Case:

def test_sorting_properties():

	class NestedTestSchema(Schema):
		class Meta:
			ordered = True

		z = fields.Str()
		y = fields.Str()

	class TestSchema(Schema):
		class Meta:
			ordered = True

		d = fields.Str()
		c = fields.Str()
		a = fields.Str()
		l = fields.Nested(NestedTestSchema)

	# Should be sorting of fields
	schema = TestSchema()

	json_schema = JSONSchema()
	dumped = json_schema.dump(schema)
	data = dot_data_backwards_compatible(dumped)

	sorted_keys = sorted(data["definitions"]["TestSchema"]["properties"].keys())
	properties_names = [k for k in sorted_keys]
	assert properties_names == ["a", "c", "d", "l"]

	sorted_keys = data["definitions"]["NestedTestSchema"]["properties"].keys()
	properties_names = [k for k in sorted_keys]

	assert properties_names == ["y", "z"]

	# Should be saving ordering of fields
	schema = TestSchema()
	json_schema = JSONSchema(props_ordered=True)
	dumped = json_schema.dump(schema)
	data = dot_data_backwards_compatible(dumped)

	keys = data["definitions"]["TestSchema"]["properties"].keys()
	properties_names = [k for k in keys]

	assert properties_names == ["d", "c", "a", "l"]

	keys = data["definitions"]["NestedTestSchema"]["properties"].keys()
	properties_names = [k for k in keys]
        # FIXME: Not ordered
	assert properties_names == ["z", "y"]

[0xDAFE]

@fuhrysteve Did you have a chance to take a look at this?