From 42b0ab77f42fe8a8122a73668b6ed6fdcbe7040b Mon Sep 17 00:00:00 2001
From: Hiroyuki Ikezoe <hikezoe@mozilla.com>
Date: Wed, 21 Feb 2018 19:36:16 +0900
Subject: [PATCH] Post DISPLAY_CHANGED_FROM_NONE sequential task if the display
 property is changed from 'none' in the case the element has script animations

---
 components/style/matching.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/components/style/matching.rs b/components/style/matching.rs
index 82db5ded7ae..594717cc52a 100644
--- a/components/style/matching.rs
+++ b/components/style/matching.rs
@@ -259,6 +259,9 @@ trait PrivateMatchMethods: TElement {
             if important_rules_changed {
                 tasks.insert(UpdateAnimationsTasks::CASCADE_RESULTS);
             }
+            if new_values.is_display_property_changed_from_none(old_values.as_ref().map(|s| &**s)) {
+                tasks.insert(UpdateAnimationsTasks::DISPLAY_CHANGED_FROM_NONE);
+            }
         }
 
         if !tasks.is_empty() {