From b92abe5c266d0c57aa4f1aa5990d9354ad5b9109 Mon Sep 17 00:00:00 2001
From: Colin Reeder <colin@vpzom.click>
Date: Sun, 11 Aug 2024 09:34:37 -0600
Subject: [PATCH] LibWeb: Avoid calling matches before evaluate

---
 Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp | 5 +++--
 Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h   | 1 +
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp
index 50a4045b19f..354a26568b5 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp
@@ -308,13 +308,14 @@ bool CSSStyleSheet::evaluate_media_queries(HTML::Window const& window)
 {
     bool any_media_queries_changed_match_state = false;
 
-    bool did_match = m_media->matches();
     bool now_matches = m_media->evaluate(window);
-    if (did_match != now_matches)
+    if (!m_did_match.has_value() || m_did_match.value() != now_matches)
         any_media_queries_changed_match_state = true;
     if (now_matches && m_rules->evaluate_media_queries(window))
         any_media_queries_changed_match_state = true;
 
+    m_did_match = now_matches;
+
     return any_media_queries_changed_match_state;
 }
 
diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h
index 11412d48f16..e541fbdb7ca 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h
@@ -100,6 +100,7 @@ private:
     JS::GCPtr<DOM::Document const> m_constructor_document;
     bool m_constructed { false };
     bool m_disallow_modification { false };
+    Optional<bool> m_did_match;
 };
 
 }