Refs #25135 -- Removed support for the contrib.admin allow_tags attribute.

Per deprecation timeline.

tests/admin_views/tests.py

@@ -35,9 +35,7 @@ from django.urls import NoReverseMatch, resolve, reverse
 from django.utils import formats, six, translation
 from django.utils._os import upath
 from django.utils.cache import get_max_age
-from django.utils.deprecation import (
-    RemovedInDjango20Warning, RemovedInDjango21Warning,
-)
+from django.utils.deprecation import RemovedInDjango21Warning
 from django.utils.encoding import force_bytes, force_text, iri_to_uri
 from django.utils.html import escape
 from django.utils.http import urlencode
@@ -4655,7 +4653,6 @@ class ReadonlyTest(AdminFieldExtractionMixin, TestCase):
     def setUp(self):
         self.client.force_login(self.superuser)
 
-    @ignore_warnings(category=RemovedInDjango20Warning)  # for allow_tags deprecation
     def test_readonly_get(self):
         response = self.client.get(reverse('admin:admin_views_post_add'))
         self.assertEqual(response.status_code, 200)
@@ -4673,12 +4670,6 @@ class ReadonlyTest(AdminFieldExtractionMixin, TestCase):
         self.assertContains(response, 'Multiline<br />test<br />string')
         self.assertContains(response, '<div class="readonly">Multiline<br />html<br />content</div>', html=True)
         self.assertContains(response, 'InlineMultiline<br />test<br />string')
-        # Remove only this last line when the deprecation completes.
-        self.assertContains(
-            response,
-            '<div class="readonly">Multiline<br />html<br />content<br />with allow tags</div>',
-            html=True
-        )
 
         self.assertContains(response, formats.localize(datetime.date.today() - datetime.timedelta(days=7)))
 
@@ -4708,7 +4699,6 @@ class ReadonlyTest(AdminFieldExtractionMixin, TestCase):
         response = self.client.get(reverse('admin:admin_views_post_change', args=(p.pk,)))
         self.assertContains(response, "%d amount of cool" % p.pk)
 
-    @ignore_warnings(category=RemovedInDjango20Warning)  # for allow_tags deprecation
     def test_readonly_text_field(self):
         p = Post.objects.create(
             title="Readonly test", content="test",
@@ -4802,7 +4792,6 @@ class ReadonlyTest(AdminFieldExtractionMixin, TestCase):
         field = self.get_admin_readonly_field(response, 'plotdetails')
         self.assertEqual(field.contents(), '-')  # default empty value
 
-    @ignore_warnings(category=RemovedInDjango20Warning)  # for allow_tags deprecation
     def test_readonly_field_overrides(self):
         """
         Regression test for #22087 - ModelForm Meta overrides are ignored by
@@ -5148,7 +5137,6 @@ class CSSTest(TestCase):
     def setUp(self):
         self.client.force_login(self.superuser)
 
-    @ignore_warnings(category=RemovedInDjango20Warning)  # for allow_tags deprecation
     def test_field_prefix_css_classes(self):
         """
         Fields have a CSS class name with a 'field-' prefix.