also calculate the position of the buttons from the right of the moon
rect and not the width (since its left it's not always 0)
svn path=/trunk/KDE/kdebase/workspace/plasma/desktoptheme/; revision=825828
shadow uses the blur filter not supported by qt
the opaque version has the picture in a separate object like the accel
version
svn path=/trunk/KDE/kdebase/workspace/plasma/desktoptheme/; revision=820935