From bea7b31445aa65c3537874e9fce3cd801869ea9a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <emilio@crisal.io>
Date: Fri, 1 Dec 2017 20:36:29 +0100
Subject: [PATCH] style: Add a missing fast-path in GeckoElement::each_class.

This shows up when inserting elements in the bloom filter.
---
 components/style/gecko/wrapper.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/components/style/gecko/wrapper.rs b/components/style/gecko/wrapper.rs
index 15d3f785b6e..dd82ec8cea8 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -1124,6 +1124,10 @@ impl<'le> TElement for GeckoElement<'le> {
     where
         F: FnMut(&Atom),
     {
+        if !self.may_have_class() {
+            return;
+        }
+
         snapshot_helpers::each_class(self.0, callback, Gecko_ClassOrClassList)
     }