fix: apply library_content transformer to all ItemBankMixin xblocks

[MaferMazu]

Description

This PR adds logic to the library_content transformer to support all xblocks that inherit from ItemBankMixin.

Supporting information

Specific case (The problem)

When creating a Problem Bank component, the structure of the xblock doesn't match (the user can solve 3 problems of 5), in the grade the system evaluates 5 problems when only 3 are solvable for the user.

Screenshot in Studio of a Problem Bank Screenshot in LMS of the Problem Bank Screenshot in Progress inside the LMS, related to the Problem Bank

Inside

The transformer didn't remove the non-selected children from the problem bank (randomized content from a content library v2 - itembankblock in the code), so the structure shows inconsistent information (more questions/grades than the user is available to see/solve)

Solution

Adding the logic to analyze the block_class and check whether it inherits from itembankmixin. I apply the same logic as the legacy library content to all xblocks with randomized content, without removing support for the legacy libraries.

Testing instructions

Pre-requisites:

• Have a tutor environment with a master or a release greater than or equal to teak (cherry-pick the commit from this branch or use this branch if you are using master)
• Have a course, and in Settings > Scheduled & Details, verify the course start date (use an old date, for example, 2020)
• Configure grading Settings > Grading.

Test:

LegacyLibraries

1. Create a Legacy Library (in Studio, click Legacy Libraries, and then +New Library) and add some problems for testing.
2. In a course, add a subsection, and then a unit, and then a "Legacy Library" component. (configure grade to the subsection)
3. Edit the "Legacy Library" component to use the library created, and if you want, you can configure how many problems are going to show to the student.
4. Publish the content.
5. Click view live version.

Things to verify in LMS (with the live version or a student account):

• In the outline, the section shows the correct number of questions.
• In the progress page, in the detailed grades, you should only see the gradable XBlocks available.

ProblemBank

1. Create a Content Library (in Studio, click +New Library) and add some problems for testing.
2. In a course, add a subsection, and then a unit, and then a "Problem Bank" component. (configure grade to the subsection)
3. Add components to the "Problem Bank", and if you want, you can configure how many problems are going to show to the student.
4. Publish the content.
5. Click view live version.

Things to verify in LMS (with the live version or a student account):
The same from the LegacyLibraries

Another Xblock (optional)

1. Install an Xblock that inherits from ItemBankMixin (for example, https://github.com/eduNEXT-collab/xblock-exam-question-bank)
2. Activate the plugin in the course https://github.com/eduNEXT-collab/xblock-exam-question-bank?tab=readme-ov-file#enabling-the-xblock-in-a-course
3. In a course, add a subsection, and then a unit, and then an "Advanced" component, and select the custom XBlock. (configure grade to the subsection)
4. Publish the content.
5. Click view live version.

Things to verify in LMS (with the live version or a student account):
The same from the LegacyLibraries

Screenshots

Base

Problem Bank Configuration (to show 1 of 4 problems)

Before

Problem Bank in LMS (problem: in the sidebar bar, it shows we had four problems available when we have 1)

After

Problem Bank in LMS (It shows we have 1 question) ✅

Progress in LMS (In the grade details, we have the correct information) ✅

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[bradenmacdonald]

Thanks for this PR! It seems like an important bug to fix, and I appreciate the clear description and diagnosis. I did some testing just now and can confirm the bugs you're seeing. I haven't tried this fix out yet, but it seems right to me.

[MaferMazu]

@bradenmacdonald, thanks for reviewing this and for your patience. I just answered your feedback. I'm attentive to further feedback. ✨

[kdmccormick]

A bug report, possibly which would be fixed by this PR? https://discuss.openedx.org/t/teak-and-ulmo-completion-checkmark-green-tick-disappears-on-refresh-for-randomized-problem-bank-xblock/18420/2

[kdmccormick]

Very important fix, thanks for finding and fixing it @MaferMazu ! The manual testing instructions look great too. I just have a suggestion on how we could simplify the implementation.

[bradenmacdonald]

I think this PR should be good to go once you've addressed @kdmccormick's comment. Let me know if you want any further review or testing from me.

[bradenmacdonald]

@MaferMazu Will you be able to finish this up soon?

Also note to self: once we've merged this, we need to look into https://discuss.openedx.org/t/teak-and-ulmo-completion-checkmark-green-tick-disappears-on-refresh-for-randomized-problem-bank-xblock/18420/3 and see if it's fixed or not.

[felipemontoya]

@bradenmacdonald mafe is on PTO and she will be back after next week. I'm sure she can take it on then.

[MaferMazu]

Thanks for your patience ✨
@kdmccormick, this is ready for a re-review. I applied your suggestion and also added tests for 'itembank' (the new problem bank). Please let me know if there is anything I can improve.

cc @bradenmacdonald

Btw, regarding #38027, and https://discuss.openedx.org/t/teak-and-ulmo-completion-checkmark-green-tick-disappears-on-refresh-for-randomized-problem-bank-xblock/18420. I replicate the behavior, and it seems fixed (create a problem bank, with 3 problems and set to show 2, and when the student finished the 2 problems, the green mark persisted)

Video demo (the important part is from 1:30, the rest was the setup)

Screencast.from.2026-04-06.19-04-17.webm

[kdmccormick]

Thank you Mafer!! 🚀

[kdmccormick]

Here's a backport, ready for review: #38296