From 2933c7effc2b4857f8d0d82f9c5096aa837a5c92 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tor=20Arne=20Vestb=C3=B8?= <tor.arne.vestbo@qt.io>
Date: Mon, 13 Jun 2022 15:03:56 +0200
Subject: [PATCH] macOS: Ignore update requests for offline displays

Accessing a display that's offline may cause crashes,
so to be on the safe side we skip update requests in
this situation.

Task-number: QTBUG-102021
Change-Id: I6b48b6722bccde628e510c538943d14f2b0271e5
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 5909e33d1dea34daef271598eb1c9dd06a238801)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/plugins/platforms/cocoa/qcocoascreen.mm | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/plugins/platforms/cocoa/qcocoascreen.mm b/src/plugins/platforms/cocoa/qcocoascreen.mm
index 6aad805158b..20efa30d3be 100644
--- a/src/plugins/platforms/cocoa/qcocoascreen.mm
+++ b/src/plugins/platforms/cocoa/qcocoascreen.mm
@@ -280,6 +280,11 @@ void QCocoaScreen::requestUpdate()
 {
     Q_ASSERT(m_displayId);
 
+    if (!isOnline()) {
+        qCDebug(lcQpaScreenUpdates) << this << "is not online. Ignoring update request";
+        return;
+    }
+
     if (!m_displayLink) {
         CVDisplayLinkCreateWithCGDisplay(m_displayId, &m_displayLink);
         CVDisplayLinkSetOutputCallback(m_displayLink, [](CVDisplayLinkRef, const CVTimeStamp*,