From 641cc29fa2fac9e616d2562e6c1a72089a78928a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fabrice=20Desr=C3=A9?= <fabrice@mozilla.com>
Date: Mon, 11 Jul 2011 01:59:33 -0700
Subject: [PATCH] Bug 596649 - Check if a web app is installed to not install
 dupes [r=mfinkle]

---
 mobile/chrome/content/common-ui.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/mobile/chrome/content/common-ui.js b/mobile/chrome/content/common-ui.js
index c6bae4c9f894..1b3af303f30e 100644
--- a/mobile/chrome/content/common-ui.js
+++ b/mobile/chrome/content/common-ui.js
@@ -1753,7 +1753,13 @@ var WebappsUI = {
   },
   
   updateWebappsInstall: function updateWebappsInstall(aNode) {
-    return !document.getElementById("main-window").hasAttribute("webapp");
+    if (document.getElementById("main-window").hasAttribute("webapp"))
+      return false;
+
+    let browser = Browser.selectedBrowser;
+
+    let webapp = Cc["@mozilla.org/webapps/support;1"].getService(Ci.nsIWebappsSupport);
+    return !(webapp && webapp.isApplicationInstalled(browser.currentURI.spec));
   },
   
   install: function(aURI, aTitle, aIcon) {