Fixed #26647 -- Included the state of all applied migrations when migrating forward.

Thanks Jasper Maes for the detailed report.

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/migrations/test_executor.py b/tests/migrations/test_executor.py
index b51e7be90e..7c33c1be5c 100644
--- a/tests/migrations/test_executor.py
+++ b/tests/migrations/test_executor.py
@@ -477,6 +477,34 @@ class ExecutorTests(MigrationTestBase):
             self.assertTableNotExists("lookuperror_b_b1")
             self.assertTableNotExists("lookuperror_c_c1")
 
+    @override_settings(
+        INSTALLED_APPS=[
+            'migrations.migrations_test_apps.mutate_state_a',
+            'migrations.migrations_test_apps.mutate_state_b',
+        ]
+    )
+    def test_unrelated_applied_migrations_mutate_state(self):
+        """
+        #26647 - Unrelated applied migrations should be part of the final
+        state in both directions.
+        """
+        executor = MigrationExecutor(connection)
+        executor.migrate([
+            ('mutate_state_b', '0002_add_field'),
+        ])
+        # Migrate forward.
+        executor.loader.build_graph()
+        state = executor.migrate([
+            ('mutate_state_a', '0001_initial'),
+        ])
+        self.assertIn('added', dict(state.models['mutate_state_b', 'b'].fields))
+        executor.loader.build_graph()
+        # Migrate backward.
+        state = executor.migrate([
+            ('mutate_state_a', None),
+        ])
+        self.assertIn('added', dict(state.models['mutate_state_b', 'b'].fields))
+
     @override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
     def test_process_callback(self):
         """