sidebar_admin_setup
Action Hook: Fires early before the Widgets administration screen loads, after scripts are enqueued.
Source: wp-admin/widgets.php:46
Action Hook: Fires early before the Widgets administration screen loads, after scripts are enqueued.
Source: wp-admin/widgets.php:46
Action Hook: Fires immediately after a widget has been marked for deletion.
Source: wp-admin/widgets.php:167
Action Hook: Fires before the Widgets administration page content loads.
Source: wp-admin/widgets.php:389
Action Hook: Fires after the available widgets and sidebars have loaded, before the admin footer.
Source: wp-admin/widgets.php:528