From 6a7a96a86cfa676834ac227d8da9a2a7f9870f2e Mon Sep 17 00:00:00 2001
From: Patrick Walton <pcwalton@mimiga.net>
Date: Tue, 28 Oct 2014 11:17:26 -0700
Subject: [PATCH] script: Don't dirty nodes that are already dirty.

---
 components/script/dom/node.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/components/script/dom/node.rs b/components/script/dom/node.rs
index 52591258387..af27aa9d4c3 100644
--- a/components/script/dom/node.rs
+++ b/components/script/dom/node.rs
@@ -622,6 +622,10 @@ impl<'a> NodeHelpers<'a> for JSRef<'a, Node> {
         // 1. Dirty self.
         self.set_has_changed(true);
 
+        if self.get_is_dirty() {
+            return
+        }
+
         // 2. Dirty descendants.
         fn dirty_subtree(node: JSRef<Node>) {
             // Stop if this subtree is already dirty.