The original commit message follows.
Fixes: Fix the windows PaintOnScreen issue once and for all
Details: To allow both the case where X11 people accidentally set
PaintOnScreen (which should not have any effect on windows)
and where people set it and subclass with paintEngine() {
return 0 } to use GDI / DirectX we do this rather nasty hack.
Original commit in Qt4: 07a2f68bd5869152471e4ffc4a63c683ef141ae8
Autotest: tst_QWidget::paintOnScreenPossible
Change-Id: Ifbb7dc4611959be3ecc362c29a1c3436b0e0fa82
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@nokia.com>
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