Installed a new Drupal 8.1.8, installed Metatag. Went to Article content type, added a field Meta Tags (field_meta_tags). While weight of every other form element can be changed via hook_form_alter() by changing the element's #weight attribute, this does not effect the Metatag field.
<?php
function mymodule_form_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id) {
$form['field_meta_tags']['#weight'] = -200;
}
?>
I have also tried this with doing this with the form pre-render callback. Setting weight does not effect the field weight.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I've created a patch that adds the weight configured in the form display. This way it's possible to move the settings by editing the form display. The only issue is that it uses the "default" form display instead of loading it dynamically.
Moving this to the 2.1.x branch.
Maybe there's a way of inheriting this from the parent class?