as far as I understand the $LEM->qcode2sgqa array does not contain multiple choice question codes
here:
https://github.com/LimeSurvey/LimeSurvey/blob/master/application/helpers/expressions/em_manager_helper.php#L8978

SGQA is : database name (or must be near). It's a related to an input inside HTML. Parent question didn't have input.

For expression manager : ONLY value save in DB exist.

For a single question Q1, for a multiple question : Q1_SQ01,Q1_SQ02, for a multiplexmultiple question (array number, array text) : Q1_SY1_SX1 etc …

For Q1 : maybe we can add something with "static" set to true with only .question, .relevance etc unsure about sgqa : since sgqa didn't exist for Q1.

ok nevermind the SGQA

the whole {Q1.*} is missing for multis. {Q1.gid}, {Q1.qcode}, {Q1.type} etc etc

Yes, but explanation still valid :).

What to shown with Q1.NAOK ? that.Q1.NAOK ?

It really a complete new feature … i already think of adding a plugin event here https://github.com/LimeSurvey/LimeSurvey/blob/2d58085ced72e2bb471aa8b4493b3730aa9e4749/application/helpers/expressions/em_manager_helper.php#L4378

To allow plugin to update, create new knowVars … something like $event->set('knownVars',$this->knownVars); $this->knownVars = $event->get('knownVars'); (in fact : i think adding Q1.help, and some Q1.number, Q1.medium (see https://gitlab.com/SondagesPro/getStatInSurvey#documentation). Then more to update current knownVars, but adding can be done too.

What did you think of such feature ? This can broke survey with badly devel plugin, but it can does a lot.

@TonisOrmisson : maybe we can add it in https://github.com/LimeSurvey/LimeSurvey/commit/011890d128084176074421cbe82cdd342706f729#diff-1a3bea26d4d8bfcd4a0422ab1b3b9864

Not complex

Is that issue solved in LS4? What is the position of core devs?

My personal opinion : it can be interesting BUT

1. Take place in memory
2. Take place in SESSION (currently)
3. Can be done in plugin (eventually core plugin (new one or update the current)