Code to assign "Answer Options" in correct order is flaky

[lithomson]

The file bridge.callback.grid has a function _assign_units_answer_options that is not reliable.

This function makes sure that "Answer Options" are numbered correctly.
It's only possible to apply to newer versions of ARC, where the *_units field is available.

Example:

1. This is okay in ARC:

        Variable / Field Name   Field Label             Choices
        demog_height            Height
        demog_height_units	    Height (select units)	1, cm | 2, in

Select cm , in
Answer Options: 1, cm | 2, in

2. This needs to be corrected:

        Variable / Field Name	Field Label                         Choices
        labs_glucose	        Random blood glucose
        labs_glucose_units      Random blood glucose (select units) 1, mmol/L | 2, mg/dL | 3, g/L

Select mmol/L, g/L
Answer Options (without this function): 1, mmol/L | 2, g/L
Required Answer Options: 1, mmol/L | 3, g/L
I.e. the numbering needs to be preserved.

This relies heavily on matching data between columns in ARC and is problematic for data discrepancies, and translations.