Popups should restore focus to the contentItem of ApplicationWindow upon closing

import QtQuick 2.6
import QtQuick.Layouts 1.1
import QtQuick.Window 2.2
import QtQuick.Controls 2.0

ApplicationWindow {
    width: 400
    height: 200
    visible: true

    onActiveFocusItemChanged: print("activeFocusItem", activeFocusItem)

    header: ToolBar {
        RowLayout {
            ToolButton {
                text: qsTr("File")
                onClicked: fileMenu.open()

                Menu {
                    id: fileMenu
                    y: parent.height

                    MenuItem {
                        text: qsTr("New")
                    }
                    MenuItem {
                        text: qsTr("open")
                    }
                    MenuItem {
                        text: qsTr("Close")
                    }
                }
            }
        }
    }

    FocusScope {
        id: focusScope
        focus: true
        anchors.fill: parent

        property bool toggled: false
        onToggledChanged: print("toggled", toggled)

        Keys.onPressed: {
            if (event.modifiers === Qt.AltModifier) {
                focusScope.toggled = true;
            }
        }
        Keys.onReleased: {
            if ((event.modifiers === Qt.AltModifier || event.key === Qt.Key_Alt) && !event.isAutoRepeat) {
                focusScope.toggled = false;
            }
        }

        RowLayout {
            anchors.centerIn: parent

            Button {
                id: penButton
                text: qsTr("Pen")
                highlighted: !focusScope.toggled
            }
            Button {
                id: eyedropperButton
                text: qsTr("Eyedropper")
                highlighted: focusScope.toggled
            }
        }
    }
}