[qtprops, opacity] add _q_ prefix to property name to make QtDesigner property editor happy, stop going up for opacity at QMdiSubWindow as well.
[qtprops, opacity] add _q_ prefix to property name to make QtDesigner property editor happy, stop going up for opacity at QMdiSubWindow as well.

KDE/qtcurve,gnufabio/qtcurve,gnufabio/qtcurve,KDE/qtcurve,gnufabio/qtcurve,KDE/qtcurve,gnufabio/qtcurve,KDE/qtcurve