Utility for visualizing and debugging high-dpi rendering
using QPainter, at different (fractional) scale factors.
In addition contains prototype code for mitigating
painting artifacts such as drawing outside the clip
rect when scaling.
Change-Id: I44f39315ad9674790d51413dddf41e3a51043da6
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
