QwtPlotMultiBarChart not equal width

[Uwe]

plotLayout()->setCanvasMargin(0);
updateCanvasMargins();

plotLayout()->setCanvasMargin(0);
updateCanvasMargins();

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The left half of the bars are cut off - guess because your code explicitly removes the margins that are needed for them. Calling QwtPlot::updateCanvasMargins(); manually - outside the replot context - doesn't make much sense too.

What happens when removing the bad lines above ?

Uwe