Use Item instead of Rectangle as a background item where possible...
Use Item instead of Rectangle as a background item where possible
Using Rectangle as background is not recommended if it is only for
color. It is more efficient to simply set the window color.
Change-Id: I3447ca394d74fa415bde4e9d2f210c81f354555e
Reviewed-by: Titta Heikkala <titta.heikkala@theqtcompany.com>