fix: fixed Configure modal for Course Unit page

[PKulkoRaccoonGang]

Description

Fixed behavior of the configuration modal window on the course unit page

Issue: #1429

Testing instructions

1. Open the new Course unit page.
2. Open the configuration modal for the unit/XBlock.
3. After saving, the configuration modal is closed.
4. For XBlock configuration modal, the Discussions checkbox is hidden.
5. For the unit configuration modal, the Discussions checkbox is visible and can be saved.

[openedx-webhooks]

Thanks for the pull request, @PKulkoRaccoonGang!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.22%. Comparing base (e118eb5) to head (72a754a).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1452      +/-   ##
==========================================
- Coverage   93.27%   93.22%   -0.05%     
==========================================
  Files        1052     1048       -4     
  Lines       20503    20397     -106     
  Branches     4312     4290      -22     
==========================================
- Hits        19125    19016     -109     
- Misses       1318     1319       +1     
- Partials       60       62       +2     

☔ View full report in Codecov by Sentry.
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[open-craft-grove]

Sandbox deployment successful 🚀
🎓 LMS
📝 Studio
ℹ️ Grove Config, Tutor Config, Tutor Requirements

[bradenmacdonald]

This looks fine, but I see some issues:

(1) This modal is called configure-modal and this component is called UnitTab. Why are we also using it for the "Manage Access" modal that XBlocks have? It seems like the only reason is that both modals have the same "user partition visibility" widget:

But this makes the code messy and more likely to have bugs like this.

I think it could be cleaner to have completely separate ConfigureModal and ManageBlockAccessModal components, and move the shared "user partition" widget to be a shared component, rather than using the Unit ConfigureModal for two different things and using the isXBlockComponent prop to alter it.

(2) After this change, if the user doesn't have any partition groups configured, the "Manage Access" modal is empty by default:

It should display an "empty state" message like the legacy UI does:

---

These don't have to block this PR; I know they're out of scope for this specific bugfix. You will need to rebase it before it can merge though.

[open-craft-grove]

Sandbox deployment successful 🚀
🎓 LMS
📝 Studio
ℹ️ Grove Config, Tutor Config, Tutor Requirements