[Qt-interest] Transparent QGraphicsProxyWidget

[Aron Bierbaum]

We have an application that uses stylesheets to set the background
color of widgets to be transparent before adding to
QGraphicsProxyWidgets and a QGraphicsScene. This allows us to have
semi-transparent windows moving around the canvas so that we can see
what is behind them. Recently we have upgraded from 4.6.0 to 4.6.2 and
we now see some rendering artifacts when caching the graphics items.
It appears that the pixmap that we are caching into doesn't get
completely cleared before re-drawing. Since the background is
semi-transparent this results in rendering artifacts. Does anyone know
how to account for this in 4.6.2 so that we get the same behavior as
we saw with 4.6.0? I have attached a simple example showing the issues
we are seeing.

Thank you,
Aron
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