black surface in desktop shell fullscreen mode

[zou lan]

Hi all

As I known, when a window is fullscreen, desktop shell will create a black
surface after it. If the window is transparent later, it shows a black
screen. But the app developers maybe except it to be hide.

Just take QWindow function hide for example, app1 start app2, then app2
call hide, it excepts to show app1, but it shows the black surface of app2.



   - Does the desktop shell doesn't support set fullscreen surface to be
   transparent?
   - Thank you.

Best Regards
Nancy
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