Fixed #25465 -- Restored line breaks conversion in admin readonly fields.

tests/admin_views/tests.py

@@ -50,7 +50,7 @@ from .models import (
     City, Collector, Color, ComplexSortedPerson, CoverLetter, CustomArticle,
     CyclicOne, CyclicTwo, DooHickey, Employee, EmptyModel, ExternalSubscriber,
     Fabric, FancyDoodad, FieldOverridePost, FilteredManager, FooAccount,
-    FoodDelivery, FunkyTag, Gallery, Grommet, Inquisition, Language,
+    FoodDelivery, FunkyTag, Gallery, Grommet, Inquisition, Language, Link,
     MainPrepopulated, ModelWithStringPrimaryKey, OtherStory, Paper, Parent,
     ParentWithDependentChildren, Person, Persona, Picture, Pizza, Plot,
     PlotDetails, PluggableSearchPerson, Podcast, Post, PrePopulatedPost, Promo,
@@ -4581,6 +4581,22 @@ class ReadonlyTest(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",
+            readonly_content='test\r\n\r\ntest\r\n\r\ntest\r\n\r\ntest',
+        )
+        Link.objects.create(
+            url="http://www.djangoproject.com", post=p,
+            readonly_link_content="test\r\nlink",
+        )
+        response = self.client.get(reverse('admin:admin_views_post_change', args=(p.pk,)))
+        # Checking readonly field.
+        self.assertContains(response, 'test<br /><br />test<br /><br />test<br /><br />test')
+        # Checking readonly field in inline.
+        self.assertContains(response, 'test<br />link')
+
     def test_readonly_post(self):
         data = {
             "title": "Django Got Readonly Fields",