Fixed #35987 -- Made ErrorList.copy() copy the renderer attribute.

django/forms/utils.py

@@ -163,6 +163,7 @@ class ErrorList(UserList, list, RenderableErrorMixin):
     def copy(self):
         copy = super().copy()
         copy.error_class = self.error_class
+        copy.renderer = self.renderer
         return copy
 
     def get_json_data(self, escape_html=False):

tests/forms_tests/tests/test_forms.py

@@ -4849,6 +4849,12 @@ class RendererTests(SimpleTestCase):
         form = CustomForm(renderer=custom)
         self.assertEqual(form.renderer, custom)
 
+    def test_get_context_errors(self):
+        custom = CustomRenderer()
+        form = Form(renderer=custom)
+        context = form.get_context()
+        self.assertEqual(context["errors"].renderer, custom)
+
 
 class TemplateTests(SimpleTestCase):
     def test_iterate_radios(self):

tests/forms_tests/tests/test_utils.py

@@ -2,6 +2,7 @@ import copy
 import json
 
 from django.core.exceptions import ValidationError
+from django.forms.renderers import DjangoTemplates
 from django.forms.utils import (
     ErrorDict,
     ErrorList,
@@ -161,6 +162,17 @@ class FormsUtilsTestCase(SimpleTestCase):
             '<a href="http://www.example.com/">example</a></li></ul>',
         )
 
+    def test_error_list_copy_attributes(self):
+        class CustomRenderer(DjangoTemplates):
+            pass
+
+        renderer = CustomRenderer()
+        e = ErrorList(error_class="woopsies", renderer=renderer)
+
+        e_copy = e.copy()
+        self.assertEqual(e.error_class, e_copy.error_class)
+        self.assertEqual(e.renderer, e_copy.renderer)
+
     def test_error_dict_copy(self):
         e = ErrorDict()
         e["__all__"] = ErrorList(