renderProcessTerminated and page reload

Hey. I will be brief.

Just open "WebEngine Demo Browser example" and run it.

Then launch task manager and kill QtWebEngineProscess.exe process to simulate "

renderProcessTerminated" signal.

You will see that page reloads, but doesn't display correctly. Moreover, it doesn't display at all until you minimize and restore the application window, or switch tabs. And if you move mouse cursor over blank white page you will see that cursor changes (for example on hyperlinks, image, inputs, etc.)