Qt 5.8 RC on Android: FileDialog opens behind Popup

[J0hnny]

This is what happens when I try to run the code below on Android 4.1.1 device.
Press "Open popup", then "Open FileDialog": FileDialog is opened, but it is positioned behind the Popup. How can I make FileDialog show up in front of the Popup? Tweaking the "modality" property of FileDialog and "z" property of Popup did not help. And yes, I need the Popup to be modal.
When buildling wIth Qt 5.7, FileDialog is displayed correctly on the same Android device, that is, in front of the Popup. So, is this a bug introduced in 5.8 RC? Should I file a bug report?

import QtQuick 2.7
import QtQuick.Controls 2.1
import QtQuick.Layouts 1.3
import QtQuick.Dialogs 1.2

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

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

    Popup {
        id: popup
        x: 220; y: 140; width: 200; height: 200
        modal: true
        Button { text: qsTr("Open FileDialog"); onClicked: fileDialog.open() }
        // z: -1 // Does not help.
    }

    FileDialog {
        id: fileDialog
        title: qsTr("File dialog")
        // modality: Qt.ApplicationModal // Does not help either.
    }
}

[SGaist]

Hi,

Can't check that but from your description it looks like a change of behaviour. You should first search the bug report system to see if it's something known. If not then yes, open a new report providing a minimal compilable example showing the behaviour.

[J0hnny]

Filed a bug QTBUG-57859