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Editing: wp-widget.php

<?php
namespace Elementor;

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

/**
 * Elementor WordPress widget control.
 *
 * A base control for creating WordPress widget control. Displays native
 * WordPress widgets. This a private control for internal use.
 *
 * @since 1.0.0
 */
class Control_WP_Widget extends Base_Data_Control {

/**
	 * Get WordPress widget control type.
	 *
	 * Retrieve the control type, in this case `wp_widget`.
	 *
	 * @since 1.0.0
	 * @access public
	 *
	 * @return string Control type.
	 */
	public function get_type() {
		return 'wp_widget';
	}

/**
	 * Get WordPress widget control default values.
	 *
	 * Retrieve the default value of the WordPress widget control. Used to return the
	 * default values while initializing the WordPress widget control.
	 *
	 * @since 1.4.3
	 * @access public
	 *
	 * @return array Control default value.
	 */
	public function get_default_value() {
		return [];
	}

/**
	 * Render WordPress widget control output in the editor.
	 *
	 * Used to generate the control HTML in the editor using Underscore JS
	 * template. The variables for the class are available using `data` JS
	 * object.
	 *
	 * @since 1.0.0
	 * @access public
	 */
	public function content_template() {
		?>
		<form action="" method="post">
			<div class="wp-widget-form-loading">Loading..</div>
		</form>
		<?php
	}
}

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