From 9e8a48457d7bc2939278cc9764c23ad788ac95e7 Mon Sep 17 00:00:00 2001
From: mrmr1993
Date: Wed, 5 Nov 2014 15:25:15 +0000
Subject: Disable scrolling for `overflow: hidden` elements

---
 content_scripts/scroller.coffee | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/content_scripts/scroller.coffee b/content_scripts/scroller.coffee
index f3c632b3..8eb50d77 100644
--- a/content_scripts/scroller.coffee
+++ b/content_scripts/scroller.coffee
@@ -38,7 +38,9 @@ ensureScrollChange = (direction, changeFn) ->
   element = activatedElement
   loop
     oldScrollValue = element[axisName]
-    changeFn(element, axisName)
+    overflow = window.getComputedStyle(element, null).getPropertyValue("overflow-#{direction}")
+    # Elements with `overflow: hidden` don't natively have scrolling, so we shouldn't scroll them.
+    changeFn(element, axisName) unless overflow == "hidden"
     break unless (element[axisName] == oldScrollValue && element != document.body)
     lastElement = element
     # we may have an orphaned element. if so, just scroll the body element.
-- 
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