class WP_Sidebar_Block_Editor_Control {}

Source

class WP_Sidebar_Block_Editor_Control extends WP_Customize_Control {
	/**
	 * The control type.
	 *
	 * @since 5.8.0
	 *
	 * @var string
	 */
	public $type = 'sidebar_block_editor';

	/**
	 * Render the widgets block editor container.
	 *
	 * @since 5.8.0
	 */
	public function render_content() {
		// Render an empty control. The JavaScript in
		// @wordpress/customize-widgets will do the rest.
	}
}

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