eca_form: eca_form_add_ajax should automatically use field widgets
Problem/Motivation
The eca_form_add_ajax action plugin allows to add an AJAX handler to a form element.
Content entity fields are usually grouped within an entity form using a "container" render element, and using a "widget" as child of that container. The Ajax action should therefore automatically recognize this and use the widget's form elements instead of the container.
Steps to reproduce
Proposed resolution
Remaining tasks
User interface changes
API changes
Data model changes
Edited by drupalbot