Done

On X11: Show backbuffer checkbox / enable disable "incremental rendering" 
spinbox according to availability
On Mac: Disable backbuffer option (but check so user knows it's enabled) / 
disable "incremental rendering" spinbox
On Windows: Disable backbuffer option (but check so user knows it's enabled) / 
enable "incremental rendering" spinbox

I hope Windows doesn't care either about PaintOnScreen neither, because it's 
not set there any more now. But no problems on this win-system here. Couldn't 
test mac though, but the changes there where minimal.

--
Matthias Kuhn
 

> -----Original Message-----
> From: Marco Hugentobler [mailto:marco.hugentob...@sourcepole.ch] 
> Sent: Wednesday, August 08, 2012 11:16 AM
> To: Kuhn Matthias, Vermessung
> Cc: qgis-developer@lists.osgeo.org
> Subject: Re: [Qgis-developer] Map canvas flickers
> 
> >If there is a good reason to leave it this way, I would hide 
> the incremental drawing option for mac completely as I'm 
> working on this code anyway.
> 
> Yes, good point. Please hide that option for Mac.
> 
> Marco
> 
> Am 08.08.2012 10:36, schrieb Kuhn Matthias, Vermessung:
> >>> I'll disable this option and remove it from the dialog on 
> any other 
> >>> than
> >>> Q_WS_X11 or do you think this can be useful for Mac as well?
> >> Disabling is fine for Mac as well (Qt::WA_PaintOnScreen 
> has no effect 
> >> on Mac).
> > I was more thinking about incremental drawing.
> > At the moment processEvents is not called inside the vector 
> renderer on Mac, so on this platform neither keytrokes (esc) 
> nor incremental rendering is possible as far as I can see. If 
> there is a good reason to leave it this way, I would hide the 
> incremental drawing option for mac completely as I'm working 
> on this code anyway.
> >
> > --
> > Matthias Kuhn
> >   
> 
> 
> --
> Dr. Marco Hugentobler
> Sourcepole -  Linux & Open Source Solutions Weberstrasse 5, 
> CH-8004 Zürich, Switzerland marco.hugentob...@sourcepole.ch 
> http://www.sourcepole.ch Technical Advisor QGIS Project 
> Steering Committee
> 
> 
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