stackView.push(component,{}) property applying order

aknew85

I have tried use new Controls 2 way to manage life of dynamical generated components and catch strange applying order (at least for me). Here is my code:

Page1.qml:

import QtQuick 2.7


Rectangle {
    property alias index: combo1.index
    property string value: ""
    onValueChanged: {
        combo1.setValue(value)
    }

    MyCombo{
        id: combo1
        anchors.fill: parent
        model: ["zero","one","two","three"]
    }
}

MyCombo.qml

import QtQuick 2.7
import QtQuick.Controls 1.4
Item {
    property alias index: combo.currentIndex
    onIndexChanged: {
        console.log("index changed")
    }

    property alias model: combo.model
    onModelChanged: {
        console.log("model changed")
    }

    ComboBox{
        id: combo
        anchors.centerIn: parent
        width: parent.width-10
    }

    function setValue(val){
        var index = model.indexOf(val)
        // HOTFIX: val==="" was added because ComboBox actually don't want to set "" as curretnText from code
        // Reason for this function: https://bugreports.qt.io/browse/QTBUG-51698
        if (index === -1 || val === ""){
            input.editText = val
        }
        else{
            input.currentIndex = index
        }
    }

}

How I load:

var component = Qt.createComponent("Page1.qml")
stackView.push(component,{index:2})
// result is good, but I can see that index was applied before model  in console

 stackView.push(component,{value:"two"})

//  here catch error qrc:/MyCombo.qml:21: TypeError: Property 'indexOf' of object 1 is not a function

I am a bit confused this fact. Of course, I have fix it in my code by manual applying model before index, but I don't know does it bug and should I create bug report or it is just sprcific feature