@ollehar : can be accepted without a plugin and a test ?

I think it's needed for plugin since some year ... for specific validation (for example validate a question via an API)

I can use it in place of 15873: setVariableExpressionEnd have lack of system to udate question part

Use-case?

Oups ... sorry

1. Fill value (if null) by an external API ($updatedValues)
2. Set hidden for organizeSurvey
3. Control validity by a complex method (call API for example) and set valid tue/false (i din't add it, but needed).

Maybe : create an event here : https://github.com/LimeSurvey/LimeSurvey/blob/03840d3441aa0eb6d2d2bf83d754b591798a6803/application/helpers/expressions/em_manager_helper.php#L6278
And allow update partially $qInfo ?

My idea is allowing plugin to update some core part :

hidden,
relevance,
validity,
Subquestion relevance

etc ...

Maybe fix 15873: setVariableExpressionEnd have lack of system to udate question part is better ?

PS:

_ValidateQuestion allow to set default value OR to set relevance or to set hidden or to set valid/invalid (then disable move next or submit survey)

:)

OK :

allowing plugin to update some core part

See setVariableExpressionEnd (and fix)

Control validity by a complex method (call API for example)

Think it can be done with Expression manager function. samplemyApiCheckvalidity(self.NAOK)

There are no way to set hidden/relevance/etc ... more dinamically (must be in setVariableExpressionEnd)