Hi,

Qt4 has three graphics system: "native" (i.e. X11 + XRender), "raster" 
and "opengl".

(1) The "opengl" system makes resizable windows slow as hell on my system.

(2) The "native" system cannot make an anti-aliased clipping.

I have found a workaround for (2) in revision #2558 (yes it's old), that 
relies on the QPainterPath::intersected() method.

But it appears now that this method is buggy, making cumulative calls to 
Paint.Clip() somewhat unpredictable.

So in revision #6815 I decided to remove that workaround.

Consequently, now, only the "raster" graphics system will be supported.

Regards,

-- 
Benoît Minisini

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