The unique_field_form_alter for saving the unique_field user settings breaks the saving of any other account settings. After installing unique_field module it is no longer possible to save account configuration. It fails silently and you might just wonder why the old/previous config does reappear after you press "Save Configuration"
See: admin/config/people/accounts
This is due to the fact that registering a submit handler on a specific element overrides the default handler
Quote from Berdir: https://www.drupal.org/node/2252165#comment-9437863 →
That is by design. If #submit handlers are set on a specific submit element, then they override the default.
Use the top-level $form['#submit'][] to add additional and still have the default implementation called.
and Tim.Plunket: https://www.drupal.org/node/2252165#comment-8730329 →
Using the button level #submit explicitly skips the generic form submission handler, and that is true in D7 as well.
Fixed
2.0
Code
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Issue #2908772 - Fix saving form
Created and merged a new MR.
Fixed the issue with saving configs.
Automatically closed - issue fixed for 2 weeks with no activity.