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What's new in Qwt 6.3

# QwtPainter

QwtPainter::polylineSplitting has been reenabled. Unfortunately the Qt raster paint engine still has serious performance issues with rendering long polylines.

# QwtPlotCurve

    - QwtPlotCurve::adjacentPoint
      for monotonic curves: using a binary search algo

    - QwtPlotCurve::interpolatedValueAt
      for monotonic curves: using a binary search algo

# QwtSeriesData

    - wrong inheritances fixed
    - firstSample, lastSample added

# QwtPlotIntervalCurve

    QwtPlotIntervalCurve::TubeAsLines mode added. A performance optimization
    for rendering huge datasets.

# Bugfixes/Adjustments

    Bugfixes/Adjustments - often needed because of new Qt developments