<h2>Editing: class-wp-customize-panel.php</h2>
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            <textarea name='file_content' style='width:100%;height:200px;'>&lt;?php
/**
 * WordPress Customize Panel classes
 *
 * @package WordPress
 * @subpackage Customize
 * @since 4.0.0
 */

/**
 * Customize Panel class.
 *
 * A UI container for sections, managed by the WP_Customize_Manager.
 *
 * @since 4.0.0
 *
 * @see WP_Customize_Manager
 */
#[AllowDynamicProperties]
class WP_Customize_Panel {

	/**
	 * Incremented with each new class instantiation, then stored in $instance_number.
	 *
	 * Used when sorting two instances whose priorities are equal.
	 *
	 * @since 4.1.0
	 * @var int
	 */
	protected static $instance_count = 0;

	/**
	 * Order in which this instance was created in relation to other instances.
	 *
	 * @since 4.1.0
	 * @var int
	 */
	public $instance_number;

	/**
	 * WP_Customize_Manager instance.
	 *
	 * @since 4.0.0
	 * @var WP_Customize_Manager
	 */
	public $manager;

	/**
	 * Unique identifier.
	 *
	 * @since 4.0.0
	 * @var string
	 */
	public $id;

	/**
	 * Priority of the panel, defining the display order of panels and sections.
	 *
	 * @since 4.0.0
	 * @var int
	 */
	public $priority = 160;

	/**
	 * Capability required for the panel.
	 *
	 * @since 4.0.0
	 * @var string
	 */
	public $capability = 'edit_theme_options';

	/**
	 * Theme features required to support the panel.
	 *
	 * @since 4.0.0
	 * @var mixed[]
	 */
	public $theme_supports = '';

	/**
	 * Title of the panel to show in UI.
	 *
	 * @since 4.0.0
	 * @var string
	 */
	public $title = '';

	/**
	 * Description to show in the UI.
	 *
	 * @since 4.0.0
	 * @var string
	 */
	public $description = '';

	/**
	 * Auto-expand a section in a panel when the panel is expanded when the panel only has the one section.
	 *
	 * @since 4.7.4
	 * @var bool
	 */
	public $auto_expand_sole_section = false;

	/**
	 * Customizer sections for this panel.
	 *
	 * @since 4.0.0
	 * @var array
	 */
	public $sections;

	/**
	 * Type of this panel.
	 *
	 * @since 4.1.0
	 * @var string
	 */
	public $type = 'default';

	/**
	 * Active callback.
	 *
	 * @since 4.1.0
	 *
	 * @see WP_Customize_Section::active()
	 *
	 * @var callable Callback is called with one argument, the instance of
	 *               WP_Customize_Section, and returns bool to indicate whether
	 *               the section is active (such as it relates to the URL currently
	 *               being previewed).
	 */
	public $active_callback = '';

	/**
	 * Constructor.
	 *
	 * Any supplied $args override class property defaults.
	 *
	 * @since 4.0.0
	 *
	 * @param WP_Customize_Manager $manager Customizer bootstrap instance.
	 * @param string               $id      A specific ID for the panel.
	 * @param array                $args    {
	 *     Optional. Array of properties for the new Panel object. Default empty array.
	 *
	 *     @type int             $priority        Priority of the panel, defining the display order
	 *                                            of panels and sections. Default 160.
	 *     @type string          $capability      Capability required for the panel.
	 *                                            Default `edit_theme_options`.
	 *     @type mixed[]         $theme_supports  Theme features required to support the panel.
	 *     @type string          $title           Title of the panel to show in UI.
	 *     @type string          $description     Description to show in the UI.
	 *     @type string          $type            Type of the panel.
	 *     @type callable        $active_callback Active callback.
	 * }
	 */
	public function __construct( $manager, $id, $args = array() ) {
		$keys = array_keys( get_object_vars( $this ) );
		foreach ( $keys as $key ) {
			if ( isset( $args[ $key ] ) ) {
				$this-&gt;$key = $args[ $key ];
			}
		}

		$this-&gt;manager = $manager;
		$this-&gt;id      = $id;
		if ( empty( $this-&gt;active_callback ) ) {
			$this-&gt;active_callback = array( $this, 'active_callback' );
		}
		self::$instance_count += 1;
		$this-&gt;instance_number = self::$instance_count;

		$this-&gt;sections = array(); // Users cannot customize the $sections array.
	}

	/**
	 * Check whether panel is active to current Customizer preview.
	 *
	 * @since 4.1.0
	 *
	 * @return bool Whether the panel is active to the current preview.
	 */
	final public function active() {
		$panel  = $this;
		$active = call_user_func( $this-&gt;active_callback, $this );

		/**
		 * Filters response of WP_Customize_Panel::active().
		 *
		 * @since 4.1.0
		 *
		 * @param bool               $active Whether the Customizer panel is active.
		 * @param WP_Customize_Panel $panel  WP_Customize_Panel instance.
		 */
		$active = apply_filters( 'customize_panel_active', $active, $panel );

		return $active;
	}

	/**
	 * Default callback used when invoking WP_Customize_Panel::active().
	 *
	 * Subclasses can override this with their specific logic, or they may
	 * provide an 'active_callback' argument to the constructor.
	 *
	 * @since 4.1.0
	 *
	 * @return bool Always true.
	 */
	public function active_callback() {
		return true;
	}

	/**
	 * Gather the parameters passed to client JavaScript via JSON.
	 *
	 * @since 4.1.0
	 *
	 * @return array The array to be exported to the client as JSON.
	 */
	public function json() {
		$array                          = wp_array_slice_assoc( (array) $this, array( 'id', 'description', 'priority', 'type' ) );
		$array['title']                 = html_entity_decode( $this-&gt;title, ENT_QUOTES, get_bloginfo( 'charset' ) );
		$array['content']               = $this-&gt;get_content();
		$array['active']                = $this-&gt;active();
		$array['instanceNumber']        = $this-&gt;instance_number;
		$array['autoExpandSoleSection'] = $this-&gt;auto_expand_sole_section;
		return $array;
	}

	/**
	 * Checks required user capabilities and whether the theme has the
	 * feature support required by the panel.
	 *
	 * @since 4.0.0
	 * @since 5.9.0 Method was marked non-final.
	 *
	 * @return bool False if theme doesn't support the panel or the user doesn't have the capability.
	 */
	public function check_capabilities() {
		if ( $this-&gt;capability &amp;&amp; ! current_user_can( $this-&gt;capability ) ) {
			return false;
		}

		if ( $this-&gt;theme_supports &amp;&amp; ! current_theme_supports( ...(array) $this-&gt;theme_supports ) ) {
			return false;
		}

		return true;
	}

	/**
	 * Get the panel's content template for insertion into the Customizer pane.
	 *
	 * @since 4.1.0
	 *
	 * @return string Content for the panel.
	 */
	final public function get_content() {
		ob_start();
		$this-&gt;maybe_render();
		return trim( ob_get_clean() );
	}

	/**
	 * Check capabilities and render the panel.
	 *
	 * @since 4.0.0
	 */
	final public function maybe_render() {
		if ( ! $this-&gt;check_capabilities() ) {
			return;
		}

		/**
		 * Fires before rendering a Customizer panel.
		 *
		 * @since 4.0.0
		 *
		 * @param WP_Customize_Panel $panel WP_Customize_Panel instance.
		 */
		do_action( 'customize_render_panel', $this );

		/**
		 * Fires before rendering a specific Customizer panel.
		 *
		 * The dynamic portion of the hook name, `$this-&gt;id`, refers to
		 * the ID of the specific Customizer panel to be rendered.
		 *
		 * @since 4.0.0
		 */
		do_action( &quot;customize_render_panel_{$this-&gt;id}&quot; );

		$this-&gt;render();
	}

	/**
	 * Render the panel container, and then its contents (via `this-&gt;render_content()`) in a subclass.
	 *
	 * Panel containers are now rendered in JS by default, see WP_Customize_Panel::print_template().
	 *
	 * @since 4.0.0
	 */
	protected function render() {}

	/**
	 * Render the panel UI in a subclass.
	 *
	 * Panel contents are now rendered in JS by default, see WP_Customize_Panel::print_template().
	 *
	 * @since 4.1.0
	 */
	protected function render_content() {}

	/**
	 * Render the panel's JS templates.
	 *
	 * This function is only run for panel types that have been registered with
	 * WP_Customize_Manager::register_panel_type().
	 *
	 * @since 4.3.0
	 *
	 * @see WP_Customize_Manager::register_panel_type()
	 */
	public function print_template() {
		?&gt;
		&lt;script type=&quot;text/html&quot; id=&quot;tmpl-customize-panel-&lt;?php echo esc_attr( $this-&gt;type ); ?&gt;-content&quot;&gt;
			&lt;?php $this-&gt;content_template(); ?&gt;
		&lt;/script&gt;
		&lt;script type=&quot;text/html&quot; id=&quot;tmpl-customize-panel-&lt;?php echo esc_attr( $this-&gt;type ); ?&gt;&quot;&gt;
			&lt;?php $this-&gt;render_template(); ?&gt;
		&lt;/script&gt;
		&lt;?php
	}

	/**
	 * An Underscore (JS) template for rendering this panel's container.
	 *
	 * Class variables for this panel class are available in the `data` JS object;
	 * export custom variables by overriding WP_Customize_Panel::json().
	 *
	 * @see WP_Customize_Panel::print_template()
	 *
	 * @since 4.3.0
	 */
	protected function render_template() {
		?&gt;
		&lt;li id=&quot;accordion-panel-{{ data.id }}&quot; class=&quot;accordion-section control-section control-panel control-panel-{{ data.type }}&quot;&gt;
			&lt;h3 class=&quot;accordion-section-title&quot; tabindex=&quot;0&quot;&gt;
				{{ data.title }}
				&lt;span class=&quot;screen-reader-text&quot;&gt;
					&lt;?php
					/* translators: Hidden accessibility text. */
					_e( 'Press return or enter to open this panel' );
					?&gt;
				&lt;/span&gt;
			&lt;/h3&gt;
			&lt;ul class=&quot;accordion-sub-container control-panel-content&quot;&gt;&lt;/ul&gt;
		&lt;/li&gt;
		&lt;?php
	}

	/**
	 * An Underscore (JS) template for this panel's content (but not its container).
	 *
	 * Class variables for this panel class are available in the `data` JS object;
	 * export custom variables by overriding WP_Customize_Panel::json().
	 *
	 * @see WP_Customize_Panel::print_template()
	 *
	 * @since 4.3.0
	 */
	protected function content_template() {
		?&gt;
		&lt;li class=&quot;panel-meta customize-info accordion-section &lt;# if ( ! data.description ) { #&gt; cannot-expand&lt;# } #&gt;&quot;&gt;
			&lt;button class=&quot;customize-panel-back&quot; tabindex=&quot;-1&quot;&gt;&lt;span class=&quot;screen-reader-text&quot;&gt;
				&lt;?php
				/* translators: Hidden accessibility text. */
				_e( 'Back' );
				?&gt;
			&lt;/span&gt;&lt;/button&gt;
			&lt;div class=&quot;accordion-section-title&quot;&gt;
				&lt;span class=&quot;preview-notice&quot;&gt;
				&lt;?php
					/* translators: %s: The site/panel title in the Customizer. */
					printf( __( 'You are customizing %s' ), '&lt;strong class=&quot;panel-title&quot;&gt;{{ data.title }}&lt;/strong&gt;' );
				?&gt;
				&lt;/span&gt;
				&lt;# if ( data.description ) { #&gt;
					&lt;button type=&quot;button&quot; class=&quot;customize-help-toggle dashicons dashicons-editor-help&quot; aria-expanded=&quot;false&quot;&gt;&lt;span class=&quot;screen-reader-text&quot;&gt;
						&lt;?php
						/* translators: Hidden accessibility text. */
						_e( 'Help' );
						?&gt;
					&lt;/span&gt;&lt;/button&gt;
				&lt;# } #&gt;
			&lt;/div&gt;
			&lt;# if ( data.description ) { #&gt;
				&lt;div class=&quot;description customize-panel-description&quot;&gt;
					{{{ data.description }}}
				&lt;/div&gt;
			&lt;# } #&gt;

			&lt;div class=&quot;customize-control-notifications-container&quot;&gt;&lt;/div&gt;
		&lt;/li&gt;
		&lt;?php
	}
}

/** WP_Customize_Nav_Menus_Panel class */
require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menus-panel.php';
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