From 99c8eb517b89a7c1acc4d4f28dde1ce6f5c7713f Mon Sep 17 00:00:00 2001
From: Stephen Blott
Date: Sat, 22 Aug 2015 11:50:36 +0100
Subject: Prevent perpetual scroll.

If we miss the keyup event while a smooth scroll is active (because the
focus changes), then we scroll forever.  This stops scrolling on blur.

Fixes #1788.
---
 content_scripts/scroller.coffee | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/content_scripts/scroller.coffee b/content_scripts/scroller.coffee
index 81c71fcd..271a7854 100644
--- a/content_scripts/scroller.coffee
+++ b/content_scripts/scroller.coffee
@@ -136,6 +136,9 @@ CoreScroller =
         handlerStack.alwaysContinueBubbling =>
           @keyIsDown = false
           @time += 1
+      blur: =>
+        handlerStack.alwaysContinueBubbling =>
+          @time += 1 if event.target == window
 
   # Return true if CoreScroller would not initiate a new scroll right now.
   wouldNotInitiateScroll: -> @lastEvent?.repeat and Settings.get "smoothScroll"
-- 
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