2 files changed, 45 insertions, 0 deletions
diff --git a/tests/regressiontests/admin_inlines/models.py b/tests/regressiontests/admin_inlines/models.py
index 4e5c4e3ae3..bb299f32b8 100644
--- a/tests/regressiontests/admin_inlines/models.py
+++ b/tests/regressiontests/admin_inlines/models.py
@@ -6,6 +6,7 @@ from django.db import models
 from django.contrib import admin
 from django.contrib.contenttypes.models import ContentType
 from django.contrib.contenttypes import generic
+from django import forms
 
 class Parent(models.Model):
     name = models.CharField(max_length=50)
@@ -123,3 +124,30 @@ class InlineWeakness(admin.TabularInline):
     extra = 1
 
 admin.site.register(Fashionista, inlines=[InlineWeakness])
+
+# Models for #13510
+
+class TitleCollection(models.Model):
+    pass
+
+class Title(models.Model):
+    collection = models.ForeignKey(TitleCollection, blank=True, null=True)
+    title1 = models.CharField(max_length=100)
+    title2 = models.CharField(max_length=100)
+
+class TitleForm(forms.ModelForm):
+
+    def clean(self):
+        cleaned_data = self.cleaned_data
+        title1 = cleaned_data.get("title1")
+        title2 = cleaned_data.get("title2")
+        if title1 != title2:
+            raise forms.ValidationError("The two titles must be the same")
+        return cleaned_data
+
+class TitleInline(admin.TabularInline):
+    model = Title
+    form = TitleForm
+    extra = 1
+
+admin.site.register(TitleCollection, inlines=[TitleInline])
diff --git a/tests/regressiontests/admin_inlines/tests.py b/tests/regressiontests/admin_inlines/tests.py
index b10474d001..915c6fac8d 100644
--- a/tests/regressiontests/admin_inlines/tests.py
+++ b/tests/regressiontests/admin_inlines/tests.py
@@ -67,6 +67,23 @@ class TestInline(TestCase):
         self.assertEqual(response.status_code, 302)
         self.assertEqual(len(Fashionista.objects.filter(person__firstname='Imelda')), 1)
 
+    def test_tabular_non_field_errors(self):
+        """
+        Ensure that non_field_errors are displayed correctly, including the
+        right value for colspan. Refs #13510.
+        """
+        data = {
+            'title_set-TOTAL_FORMS': 1,
+            'title_set-INITIAL_FORMS': 0,
+            'title_set-MAX_NUM_FORMS': 0,
+            '_save': u'Save',
+            'title_set-0-title1': 'a title',
+            'title_set-0-title2': 'a different title',
+        }
+        response = self.client.post('/test_admin/admin/admin_inlines/titlecollection/add/', data)
+        # Here colspan is "4": two fields (title1 and title2), one hidden field and the delete checkbock.
+        self.assertContains(response, '<tr><td colspan="4"><ul class="errorlist"><li>The two titles must be the same</li></ul></td></tr>')
+
 class TestInlineMedia(TestCase):
     fixtures = ['admin-views-users.xml']