WordPress at a glance
action is not described

sidebar_admin_setup action-hook . WP 2.2.0

Fires early before the Widgets administration screen loads, after scripts are enqueued.

Usage

add_action( 'sidebar_admin_setup', 'action_function_name_954' );
function action_function_name_954(){
	// action...
}

Where the hook is called

In file: /wp-admin/widgets.php
sidebar_admin_setup
wp-admin/widgets.php 46
do_action( 'sidebar_admin_setup' );
wp-includes/class-wp-customize-widgets.php 342
do_action( 'sidebar_admin_setup' );
wp-includes/class-wp-customize-widgets.php 1508
do_action( 'sidebar_admin_setup' );
wp-admin/includes/ajax-actions.php 1939
do_action( 'sidebar_admin_setup' );
wp-admin/includes/ajax-actions.php 2032
do_action( 'sidebar_admin_setup' );

Where the hook is used (in WP core)

Does not used.