...urseware/migrations/0006_create_student_module_history.py

...urseware/migrations/0007_allow_null_version_in_history.py

lms/djangoapps/courseware/models.py

lms/djangoapps/courseware/views.py

lms/envs/common.py

lms/static/sass/shared/_modal.scss

lms/templates/courseware/submission_history.html

lms/templates/courseware/xqa_interface.html

lms/templates/staff_problem_info.html

lms/urls.py