thanks for writing this up @fredvd.
this more or less summarizes my findings.
- RelatedItemsFieldWidget works
- SelectFieldWidget and AjaxSelectFieldWidget do not support ordering
(when vocabularies, and - i think - also using sources) - AjaxSelectFieldWidget dose not work with searchable vocabulary
- there is no documentation available how to write a custom source for AjaxSelectFieldWidget and people have unsolved problems in doing so
i also think that at least the training docs for different widgests should state what is supported and also mention limitations.
if there are plans/ideas how to improve this please add a link/summary here @pbauer / @alecpm.
if people know what a solution that has been agreed upon would look like, it is more likely they'll implement it.
thanks for your input