Fixed several requirements:

• Reviewer feedback cannot be edited by tutors (despite assignments)
• Tutors can always edit feedback for which they have an assignment
• Reviewer is allowed to change anything anytime

core/serializers/feedback.py

@@ -90,6 +90,7 @@ class FeedbackSerializer(DynamicFieldsModelSerializer):
 
         feedback = Feedback.objects.create(of_submission=submission,
                                            **validated_data)
+        submission.meta.feedback_authors.add(self.context['request'].user)
 
         for comment in feedback_lines:
             models.FeedbackComment.objects.create(