qwt zoomer: a complete user case scenario?

[Uwe]

m_zoomer->setEnabled(on);
m_zoomer->zoom(0);

m_zoomer->setEnabled(on);
m_zoomer->zoom(0);

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From the documentation of QwtPlotZoomer::zoom:

"A value of 0 zooms out to the zoom base."

You might complain about the documentation, but this is no excuse for not reading what is there.

Uwe