From b3e611f65dbe4426d4425550d1b3d0c7b9ec129a Mon Sep 17 00:00:00 2001
From: Gijs Kruitbosch <gijskruitbosch@gmail.com>
Date: Wed, 23 Oct 2013 20:25:03 +0200
Subject: [PATCH] Bug 929750 - fix (literal) edge case in overflow scroll test,
 r=jaws

--HG--
extra : rebase_source : ab749cade090d47eb772454ed0138fd27c4db72e
---
 browser/base/content/test/general/browser_overflowScroll.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/browser/base/content/test/general/browser_overflowScroll.js b/browser/base/content/test/general/browser_overflowScroll.js
index 34090e63442..bc82ab4193f 100644
--- a/browser/base/content/test/general/browser_overflowScroll.js
+++ b/browser/base/content/test/general/browser_overflowScroll.js
@@ -62,7 +62,11 @@ function runOverflowTests(aEvent) {
   EventUtils.synthesizeMouse(upButton, 1, 1, {});
   isLeft(element, "Scrolled one tab to the left with a single click");
 
-  element = elementFromPoint(left(scrollbox) - width(scrollbox));
+  let elementPoint = left(scrollbox) - width(scrollbox);
+  element = elementFromPoint(elementPoint);
+  if (elementPoint == right(element)) {
+    element = element.nextSibling;
+  }
   EventUtils.synthesizeMouse(upButton, 1, 1, {clickCount: 2});
   isLeft(element, "Scrolled one page of tabs with a double click");