[PyQt] Fade effect a widget on top of another widget

[Jason H]

>> That is for a cross fade. You could always fade to empty then fade out.

> I would probably do something like that for a cross fade. The fader widget
> appears to do a different kind of fade.

The only difference is it is a fade against a solid color. You could create the Pixmap, repsecting the Palette background color. and use that for intermediate fading/in/out