WordPress at a glance
action is not described

widgets.php action-hook . WP 2.8.0

Fires early when editing the widgets displayed in sidebars.

Usage

add_action( 'widgets.php', 'action_function_name_9901' );
function action_function_name_9901(){
	// action...
}

Changelog

Since 2.8.0 Introduced.

Where the hook is called

wp_ajax_save_widget()
widgets.php
WP_Customize_Widgets::customize_controls_init()
widgets.php
WP_Customize_Widgets::wp_ajax_update_widget()
widgets.php
wp_ajax_delete_inactive_widgets()
widgets.php
wp-admin/includes/ajax-actions.php 2170
do_action( 'widgets.php' );
wp-admin/includes/ajax-actions.php 2274
do_action( 'widgets.php' );

Where the hook is used (in WP core)

Usage not found!