Elementor 2.7 Beta

CustomSettings.php

<?php 
class CustomSettings extends Elementor\Core\Settings\Base\Manager {
      function get_model_for_config();
      function get_name();
      function get_saved_settings();
      function get_css_file_name();
      function save_settings_to_db();
      function get_model_for_css_file();
      function get_css_file_for_update();
}

class CustomModel  extends Elementor\Core\Settings\Base\Model {
     function get_name();
     function get_css_wrapper_selector();
     function get_panel_page_settings();
     function get_controls_list();
     function _register_controls();
}

class CustomPlugin {
    function init() {
      add_action( 'elementor/init', static function () {
        Elementor\Core\Settings±Manager::add_settings_manager( new CustomSettings() );
      }, 100, 0 );
    }
}

CustomTabs.php

<?php 
class CustomPlugin {
    function init() {
      add_action( 'elementor/init', static function () {
        Controls_Manager::add_tab('custom-tab', 'Custom Tab');
    }
}

class Widget extends Widget_Base {
  function _register_controls() {
		$this->start_controls_section(
			'section_query',
			[
				'label' => __( 'Repeater', 'advanced-el' ),
        'tab' => 'custom-tab'
			]
		);
 //[...]
  }
}

/* error generated in Elementor editor when viewing widget settings.
Uncaught Error: Routes: `panel/editor/custom-tab` not found.
    at e.value (common.min.js?ver=2.7.0-beta1:2)
    at e.value (common.min.js?ver=2.7.0-beta1:2)
    at e.value (common.min.js?ver=2.7.0-beta1:2)
    at e.value (common.min.js?ver=2.7.0-beta1:2)
    at e.value (common.min.js?ver=2.7.0-beta1:2)
    at Object.route (common.min.js?ver=2.7.0-beta1:2)
    at t.open (editor.min.js?ver=2.7.0-beta1:32)
    at e.value (common.min.js?ver=2.7.0-beta1:2)
    at Object.run (common.min.js?ver=2.7.0-beta1:2)
    at N.d.onEditRequest (editor.min.js?ver=2.7.0-beta1:2)
value @ common.min.js?ver=2.7.0-beta1:2
value @ common.min.js?ver=2.7.0-beta1:2
value @ common.min.js?ver=2.7.0-beta1:2
value @ common.min.js?ver=2.7.0-beta1:2
value @ common.min.js?ver=2.7.0-beta1:2
route @ common.min.js?ver=2.7.0-beta1:2
open @ editor.min.js?ver=2.7.0-beta1:32
value @ common.min.js?ver=2.7.0-beta1:2
run @ common.min.js?ver=2.7.0-beta1:2
onEditRequest @ editor.min.js?ver=2.7.0-beta1:2
s @ load-scripts.php?c=0&load[]=underscore,jquery-core,jquery-migrate,backbone,shortcode,utils,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload,jqu&load[]=ery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable&ver=5.2.2:10
r @ load-scripts.php?c=0&load[]=underscore,jquery-core,jquery-migrate,backbone,shortcode,utils,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload,jqu&load[]=ery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable&ver=5.2.2:10
m @ load-scripts.php?c=0&load[]=underscore,jquery-core,jquery-migrate,backbone,shortcode,utils,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload,jqu&load[]=ery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable&ver=5.2.2:10
k.trigger @ load-scripts.php?c=0&load[]=underscore,jquery-core,jquery-migrate,backbone,shortcode,utils,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload,jqu&load[]=ery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable&ver=5.2.2:10
onClickEdit @ editor.min.js?ver=2.7.0-beta1:32
dispatch @ load-scripts.php?c=0&load[]=underscore,jquery-core,jquery-migrate,backbone,shortcode,utils,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload,jqu&load[]=ery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable&ver=5.2.2:4
r.handle @ load-scripts.php?c=0&load[]=underscore,jquery-core,jquery-migrate,backbone,shortcode,utils,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-plupload,jqu&load[]=ery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable&ver=5.2.2:4
*/