Problem component is created even after clicking Cancel

[mariajgrimaldi]

Description

When adding a new Problem component in a unit, clicking Cancel does not prevent the component from being created.

The component still appears in the unit after cancelling the creation/editing flow. This may be expected if the component is created immediately when selected, but the behavior is confusing because Cancel usually implies that the action should be discarded.

I'm opening this issue to confirm whether this is the expected behavior or whether cancelling should remove the newly created component.

Steps to reproduce

1. Go to Course Authoring > Course > Add unit > Add new component.
2. Open a course unit.
3. Select Add New Component.
4. Select Problem.
5. When the problem editor opens, click Cancel instead of saving.
6. Return to the unit page.
7. Check whether the component was created.

[bradenmacdonald]

Due to the history of how the course edit page and editors were developed, this is expected behavior at the moment, but it's something we'd like to fix. If it would help, a "quick fix" would be to not open the editor automatically when creating a component, and just create it and scroll to it in the unit. If someone wants to implement that or a proper fix, I'd welcome it. However, the "proper fix" may take some time, as it's a bit complex to account for things like image uploads that happen in the editor before the new XBlock has an ID.