From 508fa1438514bb234204322bb069adac23ca7926 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Mon, 16 Oct 2017 17:16:01 +0300
Subject: [PATCH] Workaround render glitches on new MacBooks.

For unknown reason large windows have bad render glitches in High Sierra.
Forcing of OpenGL composition (by adding a fake child QOpenGLWidget) fixes it.
---
 Telegram/SourceFiles/messenger.cpp                   | 1 -
 Telegram/SourceFiles/platform/mac/main_window_mac.mm | 2 ++
 Telegram/SourceFiles/window/main_window.cpp          | 3 +++
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/Telegram/SourceFiles/messenger.cpp b/Telegram/SourceFiles/messenger.cpp
index 08489cfbce..ca9235facf 100644
--- a/Telegram/SourceFiles/messenger.cpp
+++ b/Telegram/SourceFiles/messenger.cpp
@@ -129,7 +129,6 @@ Messenger::Messenger() : QObject()
 	QMimeDatabase().mimeTypeForName(qsl("text/plain"));
 
 	_window = std::make_unique<MainWindow>();
-	_window->createWinId();
 	_window->init();
 
 	auto currentGeometry = _window->geometry();
diff --git a/Telegram/SourceFiles/platform/mac/main_window_mac.mm b/Telegram/SourceFiles/platform/mac/main_window_mac.mm
index b433bcb641..83321ec4f8 100644
--- a/Telegram/SourceFiles/platform/mac/main_window_mac.mm
+++ b/Telegram/SourceFiles/platform/mac/main_window_mac.mm
@@ -216,6 +216,8 @@ MainWindow::Private::~Private() {
 
 MainWindow::MainWindow()
 : _private(std::make_unique<Private>(this)) {
+	auto forceOpenGL = std::make_unique<QOpenGLWidget>(this);
+
 	trayImg = st::macTrayIcon.instance(QColor(0, 0, 0, 180), dbisOne);
 	trayImgSel = st::macTrayIcon.instance(QColor(255, 255, 255), dbisOne);
 
diff --git a/Telegram/SourceFiles/window/main_window.cpp b/Telegram/SourceFiles/window/main_window.cpp
index 54a805fc95..1363865b59 100644
--- a/Telegram/SourceFiles/window/main_window.cpp
+++ b/Telegram/SourceFiles/window/main_window.cpp
@@ -135,6 +135,9 @@ void MainWindow::updateWindowIcon() {
 }
 
 void MainWindow::init() {
+	Expects(!windowHandle());
+	createWinId();
+
 	initHook();
 	updateWindowIcon();