Fix QRectF to QRect cast in QwtPainterClass.drawBackground

[Adrian-B-Moreira]

When calling QwtPlotRenderer.renderTo(...), it internally calls drawBackground() where a QRectF is being assigned to QStyleOption.rect, which expects a QRect. This leads to an error: QRectF cannot be converted to QRect in this context.

The fix was explicitly convert the QRectF to a QRect before assignment.

[PierreRaybaut]

When calling QwtPlotRenderer.renderTo(...), it internally calls drawBackground() where a QRectF is being assigned to QStyleOption.rect, which expects a QRect. This leads to an error: QRectF cannot be converted to QRect in this context.

The fix was explicitly convert the QRectF to a QRect before assignment.

Thanks for reporting the issue and fixing it at the same time