Menus are unable to popup when using the Material theme in QtQuick

Parsa Mousavi

Hello everybody.
I noticed a strange bug when using the Material theme.I can open my custom context menu created using a MouseArea and a Menu with the help of a timer that triggers when the users holds a widget for 500 milliseconds (The main targets here are android phones that don't have the right-clicking functionality when using the touch screen). But that only works once when I use the Material theme.The normal theme is OK though.

I created a demo and set the theme via QQuickStyle::setStyle("Material"); and created a button like this:

import QtQuick 2.14
import QtQuick.Window 2.14
import QtQuick.Controls 2.5
import QtQuick.Controls.Styles 1.4
import QtQuick.Controls.Material 2.3
ApplicationWindow{
...
...
   Button{
        id:btn1
        width: 100
        height: 100
        anchors.left: parent.left
        text: "Click me!"
            MouseArea {
                id:mA
                anchors.fill: parent
                acceptedButtons: Qt.LeftButton | Qt.RightButton
                onClicked: {
                    if (mouse.button === Qt.RightButton)
                        contextMenu.popup()
                }
                Timer{
                    id:cttimer
                    repeat: false
                    running: false
                    interval: 500
                    onTriggered: {
                        contextMenu.popup(mA.mouseX , mA.mouseY)
                        console.log("Timer triggered")
                    }
                }

                onPressedChanged: {
                    if(pressed){
                        cttimer.running = true
                        console.log("pressed")
                    }else{
                        cttimer.running = false
                        console.log("released")
                    }
                }

                    Menu {
                        id: contextMenu
                        MenuItem { text: "Cut" ; checkable: true}
                        MenuSeparator{}
                        MenuItem { text: "Copy" }
                        MenuItem { text: "Paste" }
...
...

And please take a look at this video to see the interactions with that button.That situation is reproducible in android too.

The timer works correctly and gets triggered when I long-hold the button but the menu doesn't get popup after the first attempt.
I use Qt 5.14.2.

Any idea?

Thanks in advance.