WP_Customize_Widgets::export_preview_data()

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 * @global array $wp_registered_sidebars
 * @global array $wp_registered_widgets
 */
public function export_preview_data() {
	global $wp_registered_sidebars, $wp_registered_widgets;

	$switched_locale = switch_to_user_locale( get_current_user_id() );

	$l10n = array(
		'widgetTooltip' => __( 'Shift-click to edit this widget.' ),
	);

	if ( $switched_locale ) {
		restore_previous_locale();
	}

	$rendered_sidebars = array_filter( $this->rendered_sidebars );
	$rendered_widgets  = array_filter( $this->rendered_widgets );

	// Prepare Customizer settings to pass to JavaScript.
	$settings = array(
		'renderedSidebars'            => array_fill_keys( array_keys( $rendered_sidebars ), true ),
		'renderedWidgets'             => array_fill_keys( array_keys( $rendered_widgets ), true ),
		'registeredSidebars'          => array_values( $wp_registered_sidebars ),
		'registeredWidgets'           => $wp_registered_widgets,
		'l10n'                        => $l10n,
		'selectiveRefreshableWidgets' => $this->get_selective_refreshable_widgets(),
	);

	foreach ( $settings['registeredWidgets'] as &$registered_widget ) {
		unset( $registered_widget['callback'] ); // May not be JSON-serializable.
	}
	wp_print_inline_script_tag(

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