Handle context loss in QQuickWidget

QQuickWidget handles its own rendering, and so needs the same code as
the two render loops

Change-Id: I6549048dd77a44a52d79a7aa6fe7eceee4dbdc9a
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 10 insertions, 1 deletions

diff --git a/src/quickwidgets/qquickwidget.cpp b/src/quickwidgets/qquickwidget.cpp
index 0da9b12e86..c975404d69 100644
--- a/src/quickwidgets/qquickwidget.cpp
+++ b/src/quickwidgets/qquickwidget.cpp
@@ -283,7 +283,16 @@ void QQuickWidgetPrivate::render(bool needsSync)
 
         Q_ASSERT(context);
 
-        if (!context->makeCurrent(offscreenSurface)) {
+        bool current = context->makeCurrent(offscreenSurface);
+
+        if (!current && !context->isValid()) {
+            renderControl->invalidate();
+            current = context->create() && context->makeCurrent(offscreenSurface);
+            if (current)
+                renderControl->initialize(context);
+        }
+
+        if (!current) {
             qWarning("QQuickWidget: Cannot render due to failing makeCurrent()");
             return;
         }