[Qt-interest] pixel errors in QListWidget when setting Qt::WA_NoSystemBackground

[Markus Franke]

Dear all,

I am observing strange pixel errors within the icons of items of a 
QListWidget. (see attached screenshot)

Basically I am creating a QDialog derived class which holds the 
QListWidget. In order to get correct "rounded corners" for the dialog I am 
drawing the whole dialog by myself. The pixel errors in the screenshot 
attached appeared when I enabled the Qt::WA_NoSystemBackground flag for 
the QDialog. If I remove this flag the images get displayed correctly 
again but unfortunately the "rounded corners" will then be wrong. Below 
the QListWidget I added a QLabel with the same icon as in the QListWidget 
and there the problem does not occur. 

Furthermore, the problem only can be observed for the QWS version of Qt 
Everywhere 4.6.3. The X11 version does not show this behaviour.

Thanks for any comments on this,

Markus Franke

PS.: I sent this message to both lists because I think it's somewhat 
related to both versions of Qt.




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