[REG 5.7->5.8.0 RC] Android: some Quick Dialogs open behind modal Popup

import QtQuick 2.7
import QtQuick.Controls 2.1
import QtQuick.Layouts 1.3
import QtQuick.Dialogs 1.2
// import Qt.labs.platform 1.0 // With this import, dialogs are displayed correctly.

ApplicationWindow {
    visible: true
    width: 640; height: 480
    title: "Hello World"

    Button { text: "Open popup"; onClicked: popup.open() }

    Popup {
        id: popup
        x: 220; y: 140; width: 200; height: 200
        modal: true
        z: -1 // Does not help - dialogs are still behind the Popup.

        ListView {
            clip: true
            anchors.fill: parent
            model: [fileDialog, colorDialog, messageDialog, fontDialog]
            delegate: ItemDelegate {
                text: modelData.title
                onClicked: modelData.open()
            }
        }
    }

    ColorDialog { id: colorDialog; title: "Color dialog" }
    FontDialog { id: fontDialog; title: "Font dialog" }
    FileDialog {
        id: fileDialog
        title: "File dialog"
        modality: Qt.ApplicationModal // Does not help either.
    }

    // Only MessageDialog is displayed above the Popup.
    MessageDialog { id: messageDialog; title: "Message dialog" }
}