1 files changed, 19 insertions, 0 deletions
diff --git a/lib/quick/render_widget_host_view_qt_delegate_quick.cpp b/lib/quick/render_widget_host_view_qt_delegate_quick.cpp
index 8989759f6..2d90e772b 100644
--- a/lib/quick/render_widget_host_view_qt_delegate_quick.cpp
+++ b/lib/quick/render_widget_host_view_qt_delegate_quick.cpp
@@ -58,10 +58,29 @@ void RenderWidgetHostViewQtDelegateQuick::update(const QRect&)
     QQuickItem::update();
 }
 
+void RenderWidgetHostViewQtDelegateQuick::itemChange(ItemChange change, const ItemChangeData &value)
+{
+    QQuickItem::itemChange(change, value);
+    if (change == QQuickItem::ItemSceneChange && value.window)
+        connect(value.window, SIGNAL(frameSwapped()), SLOT(onFrameSwapped()));
+}
+
 QSGNode *RenderWidgetHostViewQtDelegateQuick::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *)
 {
     return m_client->updatePaintNode(oldNode, QQuickItem::window());
 }
+
+void RenderWidgetHostViewQtDelegateQuick::releaseResources()
+{
+    // This is the only callback we get before being removed from a window while we still know it.
+    QQuickItem::window()->disconnect(this);
+}
+
+void RenderWidgetHostViewQtDelegateQuick::onFrameSwapped()
+{
+    m_client->sendDelegatedFrameAck();
+}
+
 #endif // QT_VERSION