Fix #16

components/qtmaterialtextfield.cpp

@@ -301,7 +301,7 @@ void QtMaterialTextField::paintEvent(QPaintEvent *event)
         pen.setColor(underlineColor());
         painter.setPen(pen);
         painter.setOpacity(1);
-        painter.drawLine(2.5, y, wd, y);
+        painter.drawLine(QLineF(2.5, y, wd, y));
 
         QBrush brush;
         brush.setStyle(Qt::SolidPattern);