[Qt-interest] Semi-transparent pixmap

[Jugdish]

I'm trying to use a semi-transparent pixmap with a drag event. When the drag
is started, I create a QDrag object and then set a pixmap on it with
QDrag::setPixmap(). For some reason, the pixmap's alpha channel is not
respected if it is semi-transparent; the pixmap is painted completely
opaque. However, it *does* respect completely transparent pixels if, for
example, I do something like QPixmap::createMaskFromColor(). So I know that
the painter is looking at the pixmap's alpha channel when painting it, but
for some reason it seems to only acknowledge 0 or 1 alpha values.
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