do_action( 'load-widgets.php' )

Fires early when editing the widgets displayed in sidebars.

Source

Used By
Used By	Description
wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::wp_ajax_update_widget()	Updates widget settings asynchronously.
wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::customize_controls_init()	Ensures all widgets get loaded into the Customizer.
wp-admin/includes/ajax-actions.php: wp_ajax_save_widget()	Ajax handler for saving a widget.
wp-admin/includes/ajax-actions.php: wp_ajax_delete_inactive_widgets()	Ajax handler for removing inactive widgets.

Changelog
Version	Description
WP-2.8.0	Introduced.