From 3f688917af480d8c9b018a338e495ce8f0c37d42 Mon Sep 17 00:00:00 2001
From: Vivien Nicolas <21@vingtetun.org>
Date: Sat, 14 May 2011 12:28:27 +0200
Subject: [PATCH] Bug 656876 - Panning is broken if sidebars are collapsed
 [r=mfinkle]

---
 mobile/chrome/content/browser.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mobile/chrome/content/browser.js b/mobile/chrome/content/browser.js
index 3a69845307b3..64dc24c4380a 100644
--- a/mobile/chrome/content/browser.js
+++ b/mobile/chrome/content/browser.js
@@ -920,7 +920,7 @@ var Browser = {
     function visibility(aSidebarRect, aVisibleRect) {
       let width = aSidebarRect.width;
       aSidebarRect.restrictTo(aVisibleRect);
-      return aSidebarRect.width / width;
+      return (aSidebarRect.width ? aSidebarRect.width / width : 0);
     }
 
     if (!dx) dx = 0;