[QTI] Match question: Reused target options appear as duplicates in Studio response pool #6324

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Observed behavior

Observed while testing: #6168

When I save a question of type Match I can see duplicated items in the 'Response pool (shuffled)' section.

See the screenshot:

If I import the same question in Kolibri, then the pool is displayed correctly as each previously duplicated item is correctly displayed as a single option:

Expected behavior

When creating a question of type Match it should be possible to add 'duplicate' correct matches for the different prompts but each duplicated match should be shown as a single selectable item in the response pool.

Steps to reproduce the issue

1. Sign in to Studio at unstable
2. Go to Channel > Channel editor > New exercise
3. Create an exercise and add a question of type "Match".
4. Add Prompt 1 ("France") $\rightarrow$ Match ("Europe").
5. Add Prompt 2 ("Bulgaria") $\rightarrow$ Match ("Europe").
6. Save the question and observe the "Response pool (shuffled)" section in Studio.

Usage Details

• Studio Unstable
• OS: Windows 11
• Browser: Chrome, Firefox