use new getNode function on tree widget to get node and its attributes

mail/inc/class.mail_ui.inc.php

@@ -458,6 +458,7 @@ class mail_ui
 			'edit_acl'	=> array(
 				'caption' => 'Edit folder ACL ...',
 				'icon'	=> 'blocks',
+				'enabled'	=> 'javaScript:app.mail.mail_CheckFolderNoSelect',
 				'onExecute' => 'javaScript:app.mail.edit_acl',
 			),
 		);

mail/js/app.js

@@ -863,13 +863,14 @@ app.classes.mail = AppJS.extend(
 		// Abort if user selected an un-selectable node
 		// Use image over anything else because...?
 		var ftree = this.et2.getWidgetById(this.nm_index+'[foldertree]');
-		/*
-		if (img.indexOf('NoSelect') !== -1)
+		var node = ftree.getNode(_senders[0].id);
+
+		if (node.im0.indexOf('NoSelect') !== -1)
 		{
 			//ftree.reSelectItem(_previous);
 			return false;
 		}
-		*/
+
 		return true;
 	},