From e0c25001279119fb2469d0c2f136759a5e2dacd9 Mon Sep 17 00:00:00 2001
From: Ilya Fedin <fedin-ilja2010@ya.ru>
Date: Thu, 16 Nov 2023 00:29:58 +0400
Subject: [PATCH] Cache QWindow native interface check in
 WindowMarginsSupported()

It couldn't be changed at runtime anyway
---
 ui/platform/linux/ui_utility_linux.cpp | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/ui/platform/linux/ui_utility_linux.cpp b/ui/platform/linux/ui_utility_linux.cpp
index 933902f..8c0b5ca 100644
--- a/ui/platform/linux/ui_utility_linux.cpp
+++ b/ui/platform/linux/ui_utility_linux.cpp
@@ -533,10 +533,14 @@ std::optional<bool> IsOverlapped(
 
 bool WindowMarginsSupported() {
 #if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
-	using namespace QNativeInterface::Private;
-	QWindow window;
-	window.create();
-	if (window.nativeInterface<QWaylandWindow>()) {
+	static const auto WaylandResult = [] {
+		using namespace QNativeInterface::Private;
+		QWindow window;
+		window.create();
+		return bool(window.nativeInterface<QWaylandWindow>());
+	}();
+
+	if (WaylandResult) {
 		return true;
 	}
 #endif // Qt >= 6.5.0