[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:
                                                 |  hellofromTonya
     Type:  defect (bug)                         |      Status:  assigned
 Priority:  normal                               |   Milestone:  5.8
Component:  Widgets                              |     Version:  trunk
 Severity:  normal                               |  Resolution:
 Keywords:  needs-testing has-patch has-unit-    |     Focuses:
  tests                                          |
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Comment (by hellofromTonya):

 == Testing after applying PR

 Env:
 - OS: macOS Big Sur
 - WordPress: trunk with PR 1422 applied
 - Plugins: none
 - Theme: Twenty Twenty-One
 - Browser: Chrome (in gif), Safari, Firefox

 Script:
 The following code is added to `wp-content/mu-plugins/test53489.php`.

 {{{#!php
 <?php

 add_action( 'widgets_init', function() {
         register_sidebar(
                 array(
                         'name'          => 'Announcements',
                         'id'            => 'announcements',
                 )
         );

     register_sidebar(
                 array(
                         'name'          => 'In Post CTA',
                         'id'            => 'in-post-cta',
                 )
         );
 } );

 add_action( 'widgets_init', function() {
         register_sidebar(
                 array(
                         'name'          => 'Footer 2',
                         'id'            => 'footer-2',
                 )
         );

         register_sidebar(
                 array(
                         'name'          => 'Footer 3',
                         'id'            => 'footer-3',
                 )
         );
 }, 20 );

 }}}

 === Test 1: Registering new sidebars:

 **Expected behavior:**
 - Should remove the sidebar and move its widgets to the `Inactive widgets`
 sidebar.
 - No errors.

 **Testing steps:**
 - Comment out each of the sidebars in the supplied must use file.
 - Start with a fresh install and add 2 extra posts.
 - Go to `Appearance` > `Widgets`. Notice the default sidebars: `Footer`
 and `Inactive widgets`. There should be no widgets in the `Inactive
 widgets` area.
 - Uncomment the `Announcements` sidebar in the must use file.
 - Refresh the `Widgets` screen. Notice the new `Announcements` sidebar is
 available.
 - Add a paragraph block to it with some test.
 - Click on `Update`. Then refresh the screen. => Notice: the state of the
 widgets is retained.
 - Repeat the process with each of the new sidebar registrations.

 For my test, I also added the sidebars into the theme for them to display
 in the frontend and set the color to red for quick viewing.

 **Actual Behavior:**

 - New registered sidebars appear upon refreshing or viewing the `Widgets`
 screen ✅
 - Widgets retain the location in each of the sidebars ✅
 - No console errors ✅
 - Nothing in the `debug.log` ✅

 Works as expected ✅

 === Test 2: Removing a sidebar:

 **Expected behavior:**
 - Should remove the sidebar and move its widgets to the `Inactive widgets`
 sidebar.
 - No errors.

 **Testing steps:**
 - Comment out the `Announcements` sidebar registration in the must-use
 plugin.
 - Refresh the `Widgets` screen => Notice the `Announcements` sidebar no
 longer appears in the screen or in the frontend.
 - Expand the `Inactive widgets` sidebar => Notice: The paragraph widget
 from `Announcements` appears in this area.
 - Repeat with each of the sidebars.

 **Actual behavior:**
 - Sidebar is removed ✅
 - Widgets now appear in `Inactive widgets` sidebar ✅
 - No console errors ✅
 - Nothing in the `debug.log` ✅

 Works as expected ✅

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/53489#comment:13>
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