Frame out of date when capturing games on Windows

[mikey0000]

frame does not update when capturing windows that are games.

Way round this is to take the whole monitor and grab the window rect off the monitor. Not sure if there is a better way.

e.g

 let dw_hwnd = GetDesktopWindow();
 let box_hdc_desktop_window: BoxHDC = BoxHDC::from(dw_hwnd);

basically similar to the capture desktop but can set the width and height. This would be a nice feature to be able to capture part of the monitor instead of window.