Duplicated video window

Now integrated + floating duplicate

6e505fdf088799821c6883a5af0c78db38632d39 is the first bad commit
commit 6e505fdf088799821c6883a5af0c78db38632d39
Author: Pierre Lamot <pierre@videolabs.io>
Date:   Wed Jan 12 18:12:48 2022 +0100

    qt: fix composition with xcb_render vout display
    
    widget would normally require WindowTransparentForInput, without this we end up
    with an invisible area within our window that grabs our mouse events. But using
    this this causes rendering issues with some VoutDisplay (xcb_render for
    instance) instead, we manually, set a null intput region afterwards (see
    setTransparentForMouseEvent)

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