qt: wait until setup is done in `CompositorDirectComposition::makeMainInterface()`
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CompositorDirectComposition::setupVoutWindow()
may be called before setup is
completed, yielding an assertion failure.
It is certain that until makeMainInterface()
returns, none of the methods that
access the members that are set within setup()
are called.
Request review @robUx4.
VideoLAN code repository instance