From 73f17bf4993f3731e7d77dcc77e697323f13c207 Mon Sep 17 00:00:00 2001
From: Laszlo Agocs <laszlo.agocs@qt.io>
Date: Tue, 5 Nov 2024 13:52:28 +0100
Subject: [PATCH] eglfs: Restore raster window support code that went missing

Restore the snippet added in 4bc8f548222a0dd2967063a23e76c37d302253cb

Amends 0a10d23c4a49dd14a1ded41b7cc6921909b0ee7a

Change-Id: Id83ff523e6343003c198600fe0ee91a71fb6e3e0
Fixes: QTBUG-129512
Reviewed-by: Inho Lee <inho.lee@qt.io>
(cherry picked from commit ad50ca7d9ed3644454904488dc4719ca446e8091)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/opengl/qopenglcompositorbackingstore.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/opengl/qopenglcompositorbackingstore.cpp b/src/opengl/qopenglcompositorbackingstore.cpp
index 052f29d41e6..20c86fb8adc 100644
--- a/src/opengl/qopenglcompositorbackingstore.cpp
+++ b/src/opengl/qopenglcompositorbackingstore.cpp
@@ -141,6 +141,10 @@ void QOpenGLCompositorBackingStore::flush(QWindow *flushedWindow, const QRegion
     Q_UNUSED(region);
     Q_UNUSED(offset);
 
+    QOpenGLCompositorWindow *handle = dynamic_cast<QOpenGLCompositorWindow *>(flushedWindow->handle());
+    if (handle && !handle->backingStore())
+        handle->setBackingStore(this);
+
     if (!rhi(flushedWindow)) {
         QPlatformBackingStoreRhiConfig rhiConfig;
         rhiConfig.setApi(QPlatformBackingStoreRhiConfig::OpenGL);