Refs #28876 -- Fixed incorrect foreign key constraint name for models with quoted db_table.

Thanks Simon Charette and Tim Graham for the review and Carlos E. C.
Leite for the report.

tests/schema/tests.py

@@ -1914,6 +1914,28 @@ class SchemaTests(TransactionTestCase):
         with connection.schema_editor() as editor:
             editor.add_field(BookWithLongName, new_field)
 
+    @isolate_apps('schema')
+    @skipUnlessDBFeature('supports_foreign_keys')
+    def test_add_foreign_key_quoted_db_table(self):
+        class Author(Model):
+            class Meta:
+                db_table = '"table_author_double_quoted"'
+                app_label = 'schema'
+
+        class Book(Model):
+            author = ForeignKey(Author, CASCADE)
+
+            class Meta:
+                app_label = 'schema'
+
+        with connection.schema_editor() as editor:
+            editor.create_model(Author)
+            editor.create_model(Book)
+        if connection.vendor == 'mysql':
+            self.assertForeignKeyExists(Book, 'author_id', '"table_author_double_quoted"')
+        else:
+            self.assertForeignKeyExists(Book, 'author_id', 'table_author_double_quoted')
+
     def test_add_foreign_object(self):
         with connection.schema_editor() as editor:
             editor.create_model(BookForeignObj)