[wp-trac] [WordPress Trac] #53489: Widgets: Registered sidebar not showing in the widget editor

[WordPress Trac]

#53489: Widgets: Registered sidebar not showing in the widget editor
---------------------------+---------------------
 Reporter:  walbo          |       Owner:  (none)
     Type:  defect (bug)   |      Status:  new
 Priority:  normal         |   Milestone:  5.8
Component:  Widgets        |     Version:
 Severity:  normal         |  Resolution:
 Keywords:  needs-testing  |     Focuses:
---------------------------+---------------------

Comment (by hellofromTonya):

 Interesting finding:

 When `WP_REST_Sidebars_Controller::get_items()` is invoked, here are the
 states:

 - global `$wp_registered_sidebars` has all of the sidebars registered in
 the theme via `register_sidebar`
 - `get_option( 'sidebars_widgets', array() )` does not have the new
 sidebars as they haven't been updated yet
 - In the classic `widgets-form.php`, it's invoking `retrieve_widgets()`
 which updates global state to reflect only the registered sidebars.
 [https://github.com/WordPress/wordpress-develop/blob/master/src/wp-admin
 /widgets-form.php#L121 See it here].

 As a test, I added `retrieve_widgets()` to the top of
 `WP_REST_Sidebars_Controller::get_items()` ([https://github.com/WordPress
 /wordpress-develop/blob/ed84ca68aa61300e5dcdff603d8cf9ede6442f6d/src/wp-
 includes/rest-api/endpoints/class-wp-rest-sidebars-
 controller.php#L100-L101 here]. Refreshed, and, bam, the registered
 sidebars displayed properly.

 Doing testing to validate if this solves the problem without creating
 other problems or side effects.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/53489#comment:7>
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