Comment 9 for bug 1264821

Created attachment 84383
Render background and greeter on correct X screen

This patch is for version up to 4.11.4.

The re-factoring for Plasma 2 needs a little more research since it replaces QDeclarativeView with a QQuickView, but the same solution (passing QApplication->display()->screen(i)v) looks to be doable if the QWidget is exchangeable for the QWindow in the QQuickView constructor.