From fed5960f2c3160cd1dc717db354ef7803f4c89b1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <emilio@crisal.io>
Date: Sat, 23 Sep 2017 03:34:39 +0200
Subject: [PATCH] style: Make sure to not run any style invalidation in an
 unstyled children only traversal.

Bug: 1402472
Reviewed-by: bholley
MozReview-Commit-ID: IFPA7LJpvsZ
---
 components/style/traversal.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/components/style/traversal.rs b/components/style/traversal.rs
index 1982589e985..56df2d08728 100644
--- a/components/style/traversal.rs
+++ b/components/style/traversal.rs
@@ -838,6 +838,12 @@ where
                propagated_hint,
                child.implemented_pseudo_element());
 
+        // Make sure to not run style invalidation of styled elements in an
+        // unstyled-children-only traversal.
+        if child_data.is_some() && flags.intersects(traversal_flags::UnstyledOnly) {
+            continue;
+        }
+
         if let Some(ref mut child_data) = child_data {
             // Propagate the parent restyle hint, that may make us restyle the whole
             // subtree.