Change record status: 
Project: 
Introduced in branch: 
8.x
Description: 

The field_form_get_state() and field_form_set_state() functions are used to store processing data into $form_state for forms that include Field API widgets (most notably entity forms), and ensure no collisions occur.

In Drupal 8, the language of each individual field is not relevant to the way $form_state needs to be structured, and that $langcode parameter has been removed.

Those functions are mostly relevant for internal processing, and the change should mostly directly affect a couple of advanced widgets.

See also : Fields are no more nested under $langcode in entity $form structures

Impacts: 
Module developers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Other updates done