changed to ES6, work done by didierm

* (sciancio#73 (comment))
* Small update by Benjamin Kahn <xkahn@zoned.net>

extension.js

@@ -59,13 +59,13 @@ let Me = Extension.lookupByURL(import.meta.url);
 import * as Search from './search.js'
 import * as Terminals from './terminals.js';
 
-const ConnectionManager = new Lang.Class({
-    Name: 'ConnectionManager',
-    Extends: PanelMenu.Button,
+const ConnectionManager = new GObject.registerClass({
+    GTypeName: 'ConnectionManager',
+ }, class ConnectionManager extends PanelMenu.Button {
 
-    _init: function() {
+    _init() {
 
-        this.parent(1.0, "Connection Manager", false);
+        super._init(1.0, "Connection Manager", false);
 
         this._box = new St.BoxLayout();
 
@@ -106,17 +106,17 @@ const ConnectionManager = new Lang.Class({
         }
 
         this._readConf();
-    },
+    }
 
 
-    _readConf: function () {
+    _readConf() {
 
         this.menu.removeAll();
 
         // Rewrite _setOpenedSubMenu method to correctly open submenu
-        this.menu._setOpenedSubMenu = Lang.bind(this, function (submenu) {
+            this.menu._setOpenedSubMenu = submenu => {
             this._openedSubMenu = submenu;
-        });
+        }
 
         this._sshList = [];
 
@@ -150,21 +150,17 @@ const ConnectionManager = new Lang.Class({
         this.menu.addMenuItem(menuSepPref, this.menu.length);
 
         let menuPref = new PopupMenu.PopupMenuItem("Connection Manager Settings");
-        menuPref.connect('activate', Lang.bind(this, function() {
-            try {
-                Util.trySpawnCommandLine('python2 ' + this._prefFile);
-            } catch (e) {
-                Util.trySpawnCommandLine('python ' + this._prefFile);
-            }
-        }));
+        menuPref.connect('activate', () => {
+            Util.trySpawnCommandLine('python ' + this._prefFile);
+        });
         this.menu.addMenuItem(menuPref, this.menu.length+1);
 
         // Update ssh name list
         this._searchProvider._update(this._sshList);        
-    },
+    }
 
 
-    _readTree: function(node, parent, ident) {
+    _readTree(node, parent, ident) {
 
         let child, menuItem, menuSep, menuSub, icon, label,
             menuItemAll, iconAll, menuSepAll, menuItemTabs, iconTabs, ident_prec;
@@ -334,7 +330,7 @@ const ConnectionManager = new Lang.Class({
 
         }
         ident = ident_prec;
-    },
+    }
 
 });
 
@@ -349,7 +345,7 @@ function enable() {
 
     let file = Gio.file_new_for_path(cm._configFile);
     cm.monitor = file.monitor(Gio.FileMonitorFlags.NONE, null);
-    cm.monitor.connect('changed', Lang.bind(cm, cm._readConf));
+    cm.monitor.connect('changed', () => cm._readConf());
 }
 
 function disable() {