From f815d2f9c68fc564ed3c2193c752becb853b55b8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <emilio@crisal.io>
Date: Fri, 30 Mar 2018 21:06:34 +0200
Subject: [PATCH] style: Add a fast path to each_anonymous_content_child.

If we know that we don't have anon children it is pointless to go through FFI.
---
 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 ae8612fa490..6902093be7d 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -1121,6 +1121,10 @@ impl<'le> TElement for GeckoElement<'le> {
     where
         F: FnMut(Self),
     {
+        if !self.may_have_anonymous_children() {
+            return;
+        }
+
         let array: *mut structs::nsTArray<*mut nsIContent> =
             unsafe { bindings::Gecko_GetAnonymousContentForElement(self.0) };