From 3126683b46c4d6e29304b69332b7dcbb39e3cec5 Mon Sep 17 00:00:00 2001
From: Kris Maglione <maglione.k@gmail.com>
Date: Fri, 7 Oct 2011 07:07:49 -0400
Subject: [PATCH] Fix issue with crufty old mapping aliases.

---
 common/modules/commands.jsm | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/common/modules/commands.jsm b/common/modules/commands.jsm
index 459d4d8c..3c037cef 100644
--- a/common/modules/commands.jsm
+++ b/common/modules/commands.jsm
@@ -328,10 +328,14 @@ var Command = Class("Command", {
         });
 
         this.options.forEach(function (opt) {
-            if ("default" in opt)
-                Object.defineProperty(res, opt.names[0],
-                                      Object.getOwnPropertyDescriptor(opt, "default") ||
-                                          { configurable: true, enumerable: true, get: function () opt.default });
+            if (opt.default !== undefined) {
+                let prop = Object.getOwnPropertyDescriptor(opt, "default") ||
+                    { configurable: true, enumerable: true, get: function () opt.default };
+
+                if (prop.get && !prop.set)
+                    prop.set = function (val) { Class.replaceProperty(this, opt.names[0], val) };
+                Object.defineProperty(res, opt.names[0], prop);
+            }
         });
 
         return res;