Incorrect FHIR implementation of multiple-choice (checkbox) questions

[jonathan-reisdorf]

Describe the bug
In FHIR questionnaires, questions that support more than one answer need to be marked with "repeats": true.
Currently, the differentiation between radio button questions vs. checkbox questions is done by using either the choice or open-choice type, but the latter is meant for a different use case:
Like with choice questions, for open-choice there is a fixed list of possible answer options, but additionally a free-text field is supposed to be provided. (That is what distinguishes it from choice questions)

Expected behavior
The backend does not send questionnaires with items of type open-choice, but instead with type choice and sends an additional property "repeats": true. The frontend distinguishes radio button questions (single-choice) vs. checkbox (multiple-choice) by looking at the repeats property. If it is absent or false, radio buttons are rendered for choice questions.

Additional context

https://www.hl7.org/fhir/codesystem-item-type.html#item-type-open-choice

https://www.hl7.org/fhir/questionnaire-definitions.html#Questionnaire.item.repeats

[GolexPrime]

Could someone please have a look at the changes made in update-open-choice? The repeats property should be supported now by choices as well as open-choices. The latter now comes with its own additional text-input element.

[GolexPrime]

Should be addressed with 1fb3f56