[PyQt] Screenshot with no show

[Mads Ipsen]

Hi,

I have a GLWidget (OpenGL) based window which is used for displaying 
chemical structures. I would like to use this window to generate 
thumbnails used as icons for the files containing the chemical structures.

I would like to hide this process of icon generation from the user, so 
is there any way that you can

    * Show/display a GLWidget/QWidget in some sort of virtual frame
      buffer, in such a way that is does NOT appear visual to the user.
    * Dump the contents of the invisible window into a pixmap.

Best regards,

Mads
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