I have seen this occur when using the OpenGL paint engine (which it doesn't look like you're doing) on specific hardware. I have never seen it occur with the raster paint engine in Qt 4.8 - 5.1.
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Re: QPainter drawLine() doesn't draw the line with the right width (Is this a bug?)
I have seen this occur when using the OpenGL paint engine (which it doesn't look like you're doing) on specific hardware. I have never seen it occur with the raster paint engine in Qt 4.8 - 5.1.
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