3 files changed, 8 insertions, 1 deletions
diff --git a/src/quick/scenegraph/adaptations/software/qsgabstractsoftwarerenderer_p.h b/src/quick/scenegraph/adaptations/software/qsgabstractsoftwarerenderer_p.h
index 905577b92a..04a17ea377 100644
--- a/src/quick/scenegraph/adaptations/software/qsgabstractsoftwarerenderer_p.h
+++ b/src/quick/scenegraph/adaptations/software/qsgabstractsoftwarerenderer_p.h
@@ -63,7 +63,7 @@ class QSGSimpleRectNode;
 class QSGSoftwareRenderableNode;
 class QSGSoftwareRenderableNodeUpdater;
 
-class QSGAbstractSoftwareRenderer : public QSGRenderer
+class Q_QUICK_PRIVATE_EXPORT QSGAbstractSoftwareRenderer : public QSGRenderer
 {
 public:
     QSGAbstractSoftwareRenderer(QSGRenderContext *context);
diff --git a/src/quickwidgets/qquickwidget.cpp b/src/quickwidgets/qquickwidget.cpp
index 5aff0ee393..4c4f5fa9f3 100644
--- a/src/quickwidgets/qquickwidget.cpp
+++ b/src/quickwidgets/qquickwidget.cpp
@@ -201,6 +201,7 @@ QQuickWidgetPrivate::QQuickWidgetPrivate()
     , fakeHidden(false)
     , requestedSamples(0)
     , useSoftwareRenderer(false)
+    , forceFullUpdate(false)
 {
 }
 
@@ -306,6 +307,10 @@ void QQuickWidgetPrivate::render(bool needsSync)
         auto softwareRenderer = static_cast<QSGSoftwareRenderer*>(cd->renderer);
         if (softwareRenderer && !softwareImage.isNull()) {
             softwareRenderer->setCurrentPaintDevice(&softwareImage);
+            if (forceFullUpdate) {
+                softwareRenderer->markDirty();
+                forceFullUpdate = false;
+            }
             renderControl->render();
 
             updateRegion += softwareRenderer->flushRegion();
@@ -916,6 +921,7 @@ void QQuickWidget::createFramebufferObject()
         const QSize imageSize = size() * devicePixelRatioF();
         d->softwareImage = QImage(imageSize, QImage::Format_ARGB32_Premultiplied);
         d->softwareImage.setDevicePixelRatio(devicePixelRatioF());
+        d->forceFullUpdate = true;
         return;
     }
 
diff --git a/src/quickwidgets/qquickwidget_p.h b/src/quickwidgets/qquickwidget_p.h
index 6892e6e0b4..9747315577 100644
--- a/src/quickwidgets/qquickwidget_p.h
+++ b/src/quickwidgets/qquickwidget_p.h
@@ -144,6 +144,7 @@ public:
     bool useSoftwareRenderer;
     QImage softwareImage;
     QRegion updateRegion;
+    bool forceFullUpdate;
 };
 
 QT_END_NAMESPACE