+
+/**
+ * Customize Menu Section Class
+ *
+ * Custom section only needed in JS.
+ *
+ * @since 4.3.0
+ *
+ * @see WP_Customize_Section
+ */
+class WP_Customize_Nav_Menu_Section extends WP_Customize_Section {
+
+ /**
+ * Control type.
+ *
+ * @since 4.3.0
+ * @access public
+ * @var string
+ */
+ public $type = 'nav_menu';
+
+ /**
+ * Get section parameters for JS.
+ *
+ * @since 4.3.0
+ * @access public
+ * @return array Exported parameters.
+ */
+ public function json() {
+ $exported = parent::json();
+ $exported['menu_id'] = intval( preg_replace( '/^nav_menu\[(\d+)\]/', '$1', $this->id ) );
+
+ return $exported;
+ }
+}
+
+/**
+ * Customize Menu Section Class
+ *
+ * Implements the new-menu-ui toggle button instead of a regular section.
+ *
+ * @since 4.3.0
+ *
+ * @see WP_Customize_Section
+ */
+class WP_Customize_New_Menu_Section extends WP_Customize_Section {
+
+ /**
+ * Control type.
+ *
+ * @since 4.3.0
+ * @access public
+ * @var string
+ */
+ public $type = 'new_menu';
+
+ /**
+ * Render the section, and the controls that have been added to it.
+ *
+ * @since 4.3.0
+ * @access protected
+ */
+ protected function render() {
+ ?>
+ <li id="accordion-section-<?php echo esc_attr( $this->id ); ?>" class="accordion-section-new-menu">
+ <button type="button" class="button-secondary add-new-menu-item add-menu-toggle" aria-expanded="false">
+ <?php echo esc_html( $this->title ); ?>
+ </button>
+ <ul class="new-menu-section-content"></ul>
+ </li>
+ <?php
+ }
+}