From c0e81b26b6a86ce6e7c5e0402075b9ee4e7edc52 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Wed, 18 Dec 2019 22:16:27 +0100
Subject: [PATCH] LibHTML: Ignore layout repaints outside the visible viewport

Now that Frame knows the visible viewport rect, it can easily ignore
repaint requests from e.g <blink> elements that are not currently
scrolled into view. :^)
---
 Libraries/LibHTML/Frame.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Libraries/LibHTML/Frame.cpp b/Libraries/LibHTML/Frame.cpp
index b87fd356cc..0b26eb002a 100644
--- a/Libraries/LibHTML/Frame.cpp
+++ b/Libraries/LibHTML/Frame.cpp
@@ -45,6 +45,9 @@ void Frame::set_viewport_rect(const Rect& rect)
 
 void Frame::set_needs_display(const Rect& rect)
 {
+    if (!m_viewport_rect.intersects(rect))
+        return;
+
     if (!on_set_needs_display)
         return;
     on_set_needs_display(rect);