[1.8.x] Fixed #24628 -- Fixed applied status for squashed migrations.

Backport of 492537ac18 from master.

django/db/migrations/executor.py

@@ -110,6 +110,7 @@ class MigrationExecutor(object):
                 self.apply_migration(states[migration], migration, fake=fake, fake_initial=fake_initial)
             else:
                 self.unapply_migration(states[migration], migration, fake=fake)
+        self.check_replacements()
 
     def collect_sql(self, plan):
         """
@@ -176,6 +177,16 @@ class MigrationExecutor(object):
             self.progress_callback("unapply_success", migration, fake)
         return state
 
+    def check_replacements(self):
+        """
+        Mark replacement migrations applied if their replaced set all are.
+        """
+        applied = self.recorder.applied_migrations()
+        for key, migration in self.loader.replacements.items():
+            all_applied = all(m in applied for m in migration.replaces)
+            if all_applied and key not in applied:
+                self.recorder.record_applied(*key)
+
     def detect_soft_applied(self, project_state, migration):
         """
         Tests whether a migration has been implicitly applied - that the

django/db/migrations/loader.py

@@ -249,6 +249,8 @@ class MigrationLoader(object):
             # Mark the replacement as applied if all its replaced ones are
             if all(applied_statuses):
                 self.applied_migrations.add(key)
+        # Store the replacement migrations for later checks
+        self.replacements = replacing
         # Finally, make a graph and load everything into it
         self.graph = MigrationGraph()
         for key, migration in normal.items():