Resizing axis causes artifacts in a LineSeries binded to QAbstractTableModel

[nickaein]

I've built a sample QtQuick 2 application which plots a line series dynamically using QtCharts.

The data for the Line series comes from C++ using a model derived from QAbstractTableModel class and exposed by a QVXYModelMapper.

The problem is that during resizing the axis, some artifacts are produced in the plotted series. Specifically, a straight line appears which goes from the previous plotted point to the current plotting position.

This issue only happens for the QAbstractTableModel-based series. You can see an example of this happening several times because of resize in the following screenshot:

The buggy series is the green one. Note that the data for blue series is generated completely in QML and it doesn't have this issue.

The source code of reproducing this problem is available here:

https://github.com/nickaein/qtcharts_dynamic_series

Here is the main.qml from this source code just for reference:

import QtQuick 2.7
import QtQuick.Window 2.2
import QtQuick.Controls 2.0
import QtCharts 2.0

ApplicationWindow {
	visible: true
	width: 600
	height: 300
	property int timeStep: 0

	ChartView {
		id: chartView
		anchors.fill: parent

		ValueAxis {
			id: axisX
			min: 0
			max: 400
		}

		Component.onCompleted:  {
			mapper.series = series2
		}

		LineSeries {
			id: series1
			axisX: axisX
		}

		LineSeries {
			id: series2
			axisX: axisX
		}
	}

	Timer {
		interval: 100
		repeat: true
		running: true
		onTriggered: {
			timeStep++;
			var y = (1+Math.cos(timeStep/10.0))/2.0;
			series1.append(timeStep, y);
		}
	}
}