If the SpinBox is not editable, valueFromText should never be called

import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.0

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Spinbox Test")
    ColumnLayout{
        Button {
            id:but1
            text: "Button 1"
        }
        SpinBox {
            focus: true
            from: 10
            to: 1000
            value: 100
            editable : false
            KeyNavigation.backtab: but1
            KeyNavigation.tab: but2
            KeyNavigation.left: but1
            KeyNavigation.right: but2
            textFromValue : function(value, locale) {
                console.log("textFromValue called")
                return Number(value).toLocaleString(locale, 'f', 0);
            }
            valueFromText : function(text, locale) {
                console.log("valueFromText called")
                return Number.fromLocaleString(locale, text);
            }
        }
        Button {
            id:but2
            text: "Button 2"
        }
    }
}