By drawing the same gradient for the triangle as in the rasterwindow example.
We also set a default geometry and show the window without forcing it to become
maximized.
Change-Id: I05f9138d08f9c5d3e30eec362a3a1cd63d72753e
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
384e72bdb3