The Qt application does not redraw own surface if it is an ivi-wayland client.

import QtQuick 2.2
import QtQuick.Window 2.2

Window {
    id: window
    width: 400
    height: 400
    color: "blue"
    visible: true

    Column {
        spacing: 8

        Row {
            spacing: 8

            Repeater {
                model: ListModel {
                    ListElement { label: "Windowed"; value: Window.Windowed }
                    ListElement { label: "Maximized"; value: Window.Maximized }
                    ListElement { label: "FullScreen"; value: Window.FullScreen }
                }

                Rectangle {
                    width: 96
                    height: 40
                    color: "gainsboro"

                    MouseArea {
                        anchors.fill: parent
                        onClicked: {
                            window.visibility = model.value

                            sometext_ID.text = index
                            console.log("index", index)
                            switch (index) {
                            case    0:
                                window.color = "#ff0000"
                                break
                            case    1:
                                window.color = "#00ff00"
                                break
                            case    2:
                                window.color = "#ffff00"
                                break
                            }

                            console.log("window.color", window.color)
                        }

                        Text {
                            anchors.centerIn: parent
                            text: model.label
                        }
                    }
                }
            }
        }

        Text {
            id: sometext_ID

            color: "white"
            text: {
                switch (window.visibility) {
                case Window.Windowed:
                    return "windowed";
                case Window.Maximized:
                    return "maximized";
                case Window.FullScreen:
                    return "fullscreen";
                case Window.Minimized:
                    return "minimized";
                case Window.AutomaticVisibility:
                    return "automatic";
                case Window.Hidden:
                    return "hidden";
                default:
                    break;
                }
                return "unknown";
            }
        }
    }
}

$ QT_WAYLAND_SHELL_INTEGRATION=ivi-shell ./qmlclient
QML debugging is enabled. Only use this in a safe environment.
Using Brcm-EGL
Using the 'ivi-shell' shell integration
qml: index 1
qml: window.color #00ff00
qml: index 2
qml: window.color #ffff00
qml: index 0
qml: window.color #ff0000

$ QT_IM_MODULE=qtvirtualkeyboard ./pure-qml
Unable to query physical screen size, defaulting to 100 dpi.
To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).

$ ./qmlclient -platform wayland