From b1fca78cba8dddf41802c5a2001290ae8b6f46a1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <ecoal95@gmail.com>
Date: Fri, 12 Aug 2016 14:35:03 -0700
Subject: [PATCH] layout: Mark correctly parents of dirty elements.

---
 components/layout_thread/lib.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/components/layout_thread/lib.rs b/components/layout_thread/lib.rs
index acc1daca80b..f9389fc1ecd 100644
--- a/components/layout_thread/lib.rs
+++ b/components/layout_thread/lib.rs
@@ -1114,6 +1114,14 @@ impl LayoutThread {
                     if node.needs_dirty_on_viewport_size_changed() {
                         // NB: The dirty bit is propagated down the tree.
                         unsafe { node.set_dirty(true); }
+
+                        let mut current = node.parent_node();
+                        while let Some(node) = current {
+                            if node.has_dirty_descendants() { break; }
+                            unsafe { node.set_dirty_descendants(true); }
+                            current = node.parent_node();
+                        }
+
                         next = iter.next_skipping_children();
                     } else {
                         next = iter.next();