Options module should not prevent field storage updates when switching to/from function

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Here's a quick patch.

Drupal 9.2.0-alpha1 → will be released the week of May 3, 2021, which means new developments and disruptive changes should now be targeted for the 9.3.x-dev branch. For more information see the Drupal core minor version schedule → and the Allowed changes during the Drupal core release cycle → .

@bkosborne

I also fixed hook_field_storage_config_update_forbid() in field.api.php since the member $field_storage->module has protected access.

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Thank you for this fix.

It was tagged for tests though so moving back to needs work for those.

Rebased on to an MR, still needs tests.

Hi!

It seems the issue is even bigger since 10.2 because the ListItemBase.php is changed now and it has code parts like
core/modules/options/src/Plugin/Field/FieldType/ListItemBase.php

    if (!$form_state->get('items_count')) {
      $form_state->set('items_count', max(count($allowed_values), 0));
    }

must be of type Countable|array, null given in count()
or

$current_keys = array_keys($allowed_values);

must be of type array, null given in array_keys()

Because it is possible to empty the allowed values by manually editing and importing config, but since 10.2 the system fails when the $allowed_values is empty.