Relying on the hard clipping of QRegion widget masks to create
non-rectangular windows is a solution from a bygone era. The result
looks horrible with today's eyes, particularly on a high-dpi
screen. Update the example to create smooth anti-aliased edges using
translucent window bacground.
Task-number: QTBUG-64229
Change-Id: I8859d61177d2a2dc446632c23f27f42050e0d7c7
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Andy Shaw <andy.shaw@qt.io>
191ac31598