From 117dd20cc60030d79bc79d793ff3de4ea5514ad1 Mon Sep 17 00:00:00 2001
From: gdh1995
Date: Mon, 27 Aug 2018 22:06:00 +0800
Subject: use Element::scrollBy if it exists

---
 content_scripts/scroller.coffee | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'content_scripts')

diff --git a/content_scripts/scroller.coffee b/content_scripts/scroller.coffee
index 7202c682..2ce4d13b 100644
--- a/content_scripts/scroller.coffee
+++ b/content_scripts/scroller.coffee
@@ -56,7 +56,12 @@ getDimension = (el, direction, amount) ->
 performScroll = (element, direction, amount) ->
   axisName = scrollProperties[direction].axisName
   before = element[axisName]
-  element[axisName] += amount
+  if typeof element.scrollBy is "function"
+    scrollArg = behavior: "instant"
+    scrollArg[if axisName is "x" then "left" else "top"] = amount
+    element.scrollBy scrollArg
+  else
+    element[axisName] += amount
   element[axisName] != before
 
 # Test whether `element` should be scrolled. E.g. hidden elements should not be scrolled.
-- 
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