Memory leak when modifying a model of a MapItemView

somso2e

When modifying the model of a MapItemView, memory usage increases indefinitely but when the model is replaced completely it works fine.

I've also tried with a custom QAbstractListModel where the data is changed when an external signal is triggered. the data is replaced and beginResetModel() and endResetModel() are called accordingly. But the leak is still happening.

A minimal example to see the effect. Change the 1 in the trigger callback to see the difference.

import QtQuick
import QtLocation
import QtPositioning

Window {
    id: window
    width: 640
    height: 480
    visible: true
    property list<var> myModel: []
    Timer {
        interval: 1
        running: true
        repeat: true
        onTriggered: {
            // 1: leak happens, 0: no leak
            if (1) {
                myModel = []
                for (var i = 0; i < 10; i++) {
                    let longitude = Math.random() * 360 - 180
                    let latitude = Math.random() * 180 - 90
                    myModel[i] = QtPositioning.coordinate(latitude, longitude)
                }
            } else {
                let newModel = []
                for (var j = 0; j < 10; j++) {
                    let longitude = Math.random() * 360 - 180
                    let latitude = Math.random() * 180 - 90
                    newModel[i] = QtPositioning.coordinate(latitude, longitude)
                }
                myModel = newModel
            }
        }
    }
    Map {
        anchors.fill: parent
        plugin: Plugin {
            name: "osm"
        }
        MapItemView {
            model: myModel
            delegate: MapQuickItem {
                visible: true
                coordinate: modelData
            }
        }
    }
}

OS: Ubuntu 20.04.6 LTS x86_64
Kernel: 5.15.0-107-generic

yapcumt

I have encountered a similar problem, which has not been resolved. However, your example does not illustrate this issue.I test the example ，when myModel = newModel，print myModel.length =0