From b6703d1189de13eb0f55333ef42cb769d121fd2b Mon Sep 17 00:00:00 2001
From: Florian Bruhin <git@the-compiler.org>
Date: Thu, 14 Jun 2018 00:16:09 +0200
Subject: [PATCH] Avoid unnecessary CSS updates

---
 qutebrowser/javascript/stylesheet.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/qutebrowser/javascript/stylesheet.js b/qutebrowser/javascript/stylesheet.js
index b1cdeb26e..daa51ca12 100644
--- a/qutebrowser/javascript/stylesheet.js
+++ b/qutebrowser/javascript/stylesheet.js
@@ -113,14 +113,19 @@ window._qutebrowser.stylesheet = (function() {
         if (!initialized) {
             init();
         }
+
+        if (css_content === css) {
+            return;
+        }
+
+        css_content = css;
+
         if (style_elem) {
             style_elem.textContent = css;
             // The browser seems to rewrite the document in same-origin frames
             // without notifying the mutation observer. Ensure that the
             // stylesheet is in the current document.
             watch_root();
-        } else {
-            css_content = css;
         }
         // Propagate the new CSS to all child frames.
         // FIXME:qtwebengine This does not work for cross-origin frames.