From a57c86f4ea23828450beb3deccf928752ebe3ad9 Mon Sep 17 00:00:00 2001
From: Ben Ogle <ogle.ben@gmail.com>
Date: Tue, 1 Oct 2013 16:48:19 -0700
Subject: [PATCH] Shortcut out of isHidden when we can.

Checking computed style is an order of magnitude more expensive than
checking the style property.
---
 src/jquery-extensions.coffee | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/jquery-extensions.coffee b/src/jquery-extensions.coffee
index 25cf799b9..76ee60178 100644
--- a/src/jquery-extensions.coffee
+++ b/src/jquery-extensions.coffee
@@ -40,7 +40,14 @@ $.fn.isVisible = ->
 $.fn.isHidden = ->
   # We used to check @is(':hidden'). But this is much faster than the
   # offsetWidth/offsetHeight check + all the pseudo selector mess in jquery.
-  @css('display') == 'none'
+  style = this[0].style
+
+  if style.display == 'none' or not @isOnDom()
+    true
+  else if style.display
+    false
+  else
+    getComputedStyle(this[0]).display == 'none'
 
 $.fn.isDisabled = ->
   !!@attr('disabled')