fix: Maintain compound field types ordering

tests/codegen/handlers/test_create_compound_fields.py

@@ -4,10 +4,9 @@
 from xsdata.codegen.handlers import CreateCompoundFields
 from xsdata.codegen.models import Restrictions
 from xsdata.models.config import GeneratorConfig
-from xsdata.models.enums import DataType
 from xsdata.models.enums import Tag
+from xsdata.utils import collections
 from xsdata.utils.testing import AttrFactory
-from xsdata.utils.testing import AttrTypeFactory
 from xsdata.utils.testing import ClassFactory
 from xsdata.utils.testing import ExtensionFactory
 from xsdata.utils.testing import FactoryTestCase
@@ -92,7 +91,9 @@ def test_group_fields(self):
             name="choice",
             tag="Choice",
             index=0,
-            types=list({t for attr in target.attrs for t in attr.types}),
+            types=collections.unique_sequence(
+                t for attr in target.attrs for t in attr.types
+            ),
             choices=[
                 AttrFactory.create(
                     tag=target.attrs[0].tag,

xsdata/codegen/handlers/create_compound_fields.py

@@ -13,6 +13,7 @@
 from xsdata.codegen.utils import ClassUtils
 from xsdata.formats.dataclass.models.elements import XmlType
 from xsdata.models.enums import Tag
+from xsdata.utils import collections
 from xsdata.utils.collections import group_by
 
 ALL = "a"
@@ -88,7 +89,7 @@ def group_fields(self, target: Class, attrs: List[Attr]):
 
         min_occurs, max_occurs = self.sum_counters(counters)
         name = self.choose_name(target, names)
-        types = list({t for attr in attrs for t in attr.types})
+        types = collections.unique_sequence(t for attr in attrs for t in attr.types)
 
         target.attrs.insert(
             pos,