QPainter drops e.g. lines using small (< 1e-12) user world coords

QCosmeticStroker::drawLine(const QPointF &p1, const QPointF &p2)

performs a comparison of both input QPointF parameters BEFORE they are transformed into device coords!

If the coordinates are < 1e-12 only a single point is drawn because of usage of qFuzzyIsNull in operator==

We use scientific data, like pico and nano amps! Most likely there are more issues of this nature!

SOURCE CODE

void QCosmeticStroker::drawLine(const QPointF &p1, const QPointF &p2)

}{{   

// comparison should be on start and end below, not p1 and p2

{{  if (p1 == p2) }}

  { }}{{          

    drawPoints(&p1, 1);{{        }}

    return;{{    }}

   } {{    }}

   QPointF start = p1 * state->matrix;{{    }}

   QPointF end = p2 * state->matrix;

   .

   .

   .

}