WP_Widget_Media::enqueue_preview_scripts()
Enqueue preview scripts.
Description
These scripts normally are enqueued just-in-time when a widget is rendered. In the customizer, however, widgets can be dynamically added and rendered via selective refresh, and so it is important to unconditionally enqueue them in case a widget does get added.
Source
File: wp-includes/widgets/class-wp-widget-media.php
public function enqueue_preview_scripts() {}  Changelog
| Version | Description | 
|---|---|
| 4.8.0 | Introduced. | 
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Licensed under the GNU GPLv2+ License.
    https://developer.wordpress.org/reference/classes/wp_widget_media/enqueue_preview_scripts