Can not hide window after called showNormal() when window is FullScreen state

[Dylan Deng]

This following code shows the problem on macOS. I can't hide the window after called showNormal() function, the window keeps showing. What the best way to hide window after called showNormal() when window is FullScreen?

I'm using Qt 5.14.2/5.15.0
OS: macOS 10.15.6

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12
import QtQuick.Layouts 1.12

Window {
    id: mainWindow
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    Component.onCompleted: {
        mainWindow.showFullScreen()
    }

    RowLayout {
        anchors.centerIn: parent

        Button {
            text: qsTr('Hide')
            onClicked: {
               if (mainWindow.visibility === Window.FullScreen) {
                   mainWindow.showNormal()
                   mainWindow.visible = false
               } else {
                   mainWindow.visible = false
               }
            }
        }
    }
}