ScreenGadget visualizes virtual desktop screen layout,
in device independent and native pixels.
This can be used to debug the (sometimes surprising)
device independent screen geometry resulting from Qt
applying a scale factor.
Change-Id: I5b18e0fc9a54ba3e14d648794429b2eeadd25748
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
