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VerticalScrollBar()->triggerAction(QAbstractSlider::SliderPageStepAdd) sometimes work and othertimes doesn't work

  • I use this code
    to reimplement the pagedown in a QTextBrowser.
    It works always fine on desktop but on symbian it often doesn't work but after some singleLineStepAdd it restart to work.
    Is it a bug? How I can solve?
    Thank you

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