Make tst_nodes use QSGRenderLoop to behave more like QQuickWindow
Make tst_nodes use QSGRenderLoop to behave more like QQuickWindow

Change-Id: I284164a45cabdb9f1fdbc2050db0cb00810ce946
Reviewed-by: Sean Harmer <dd3a28a27ba8fc1a24091f8e1ee0edededfbc9cc@kdab.com>

mgrunditz/qtdeclarative-2d,qmlc/qtdeclarative,mgrunditz/qtdeclarative-2d,matthewvogt/qtdeclarative,qmlc/qtdeclarative,qmlc/qtdeclarative,qmlc/qtdeclarative,mgrunditz/qtdeclarative-2d,qmlc/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,mgrunditz/qtdeclarative-2d,mgrunditz/qtdeclarative-2d,mgrunditz/qtdeclarative-2d,qmlc/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,mgrunditz/qtdeclarative-2d,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,qmlc/qtdeclarative,qmlc/qtdeclarative,matthewvogt/qtdeclarative