From a20ee861d673bb3475a9b5c94743c448a9ac8d52 Mon Sep 17 00:00:00 2001
From: Aleix Pol <aleixpol@kde.org>
Date: Mon, 6 Mar 2023 01:11:45 +0100
Subject: [PATCH] client: Do not cast placeholder screens to QWaylandScreen

It's wrong to C-cast an object to a class that isn't theirs. Check if it
is a placeholder first.

Pick-to: 5.15 6.2 6.5
Change-Id: I45d3c423422ae6638a033fb0f4cfefc7cd4460f0
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
Reviewed-by: David Edmundson <davidedmundson@kde.org>
---
 src/plugins/platforms/wayland/qwaylandnativeinterface.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/plugins/platforms/wayland/qwaylandnativeinterface.cpp b/src/plugins/platforms/wayland/qwaylandnativeinterface.cpp
index 2c1cdb98b09..65272f3c228 100644
--- a/src/plugins/platforms/wayland/qwaylandnativeinterface.cpp
+++ b/src/plugins/platforms/wayland/qwaylandnativeinterface.cpp
@@ -159,7 +159,7 @@ void *QWaylandNativeInterface::nativeResourceForScreen(const QByteArray &resourc
 {
     QByteArray lowerCaseResource = resourceString.toLower();
 
-    if (lowerCaseResource == "output")
+    if (lowerCaseResource == "output" && !screen->handle()->isPlaceholder())
         return ((QWaylandScreen *) screen->handle())->output();
 
     return nullptr;