Event handling after release of QwtPlotZoomer.

[npatil15]

Okay,
The 2nd solution works perfectly for me, without error.
For the reference, mentioned the solution here,

class YourMarker: public QwtPlotMarker
    {
    public:
        YourMarker( ... )
        {
            setItemAttribute( QwtPlotItem::ScaleInterest, true );
        }
 
        void updateScaleDiv( const QwtScaleDiv& xMap, const QwtScaleDiv& ) override
        {
            const double margin = ...; // pixels
 
            const double min = xMap.invTransform( xMap.p1() + margin );
            const double max = xMap.invTransform( xMap.p2() - margin );
 
            setXValue( qBound( min, xValue(), max ) );
        }
    };

class YourMarker: public QwtPlotMarker
    {
    public:
        YourMarker( ... )
        {
            setItemAttribute( QwtPlotItem::ScaleInterest, true );
        }
     
        void updateScaleDiv( const QwtScaleDiv& xMap, const QwtScaleDiv& ) override
        {
            const double margin = ...; // pixels
     
            const double min = xMap.invTransform( xMap.p1() + margin );
            const double max = xMap.invTransform( xMap.p2() - margin );
     
            setXValue( qBound( min, xValue(), max ) );
        }
    };

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Thank you so much