From 382a89511a3999da3a9464da9cd3959997b7df14 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <emilio@crisal.io>
Date: Fri, 1 Dec 2017 20:17:53 +0100
Subject: [PATCH] style: Add a fast-path for GeckoElement::is_root.

---
 components/style/gecko/wrapper.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/components/style/gecko/wrapper.rs b/components/style/gecko/wrapper.rs
index 15d3f785b6e..2babb8664a7 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -1917,6 +1917,15 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
 
     #[inline]
     fn is_root(&self) -> bool {
+        let parent_node = match self.as_node().parent_node() {
+            Some(parent_node) => parent_node,
+            None => return false,
+        };
+
+        if !parent_node.is_document() {
+            return false;
+        }
+
         unsafe {
             Gecko_IsRootElement(self.0)
         }