How to show message on resume from sleep mode

KejPi

Hello, I would need to display message to the user after resume from sleep mode on Windows. My application is based on Qt 5.15.13, I can detect resume from sleep mode event using NativeEventFilter, I can pass this event to QML using signal but it seems that QML UI is not repaint after resuming from sleep mode. UI stays the same as before entering sleep mode and it is repaint after resizing the window. Is there a way for force update of the QML UI?

I have created simple application showing the issue. There is a connection from event filter that simply makes Rectangle visible but nothing happens until window is resized.

Interesting pieces of the code:

    if (eventType == "windows_generic_MSG") {
        MSG* msg = static_cast<MSG*>(message);
        if (msg->message == WM_POWERBROADCAST) {
            switch (msg->wParam) {
                case PBT_APMPOWERSTATUSCHANGE:
                    qDebug() << ("PBT_APMPOWERSTATUSCHANGE received");
                    eventProcessed = true;
                    break;
                case PBT_APMRESUMEAUTOMATIC:
                    qDebug() << ("PBT_APMRESUMEAUTOMATIC received");
                    eventProcessed = true;
                    break;
                case PBT_APMRESUMESUSPEND:
                    qDebug() << ("PBT_APMRESUMESUSPEND received");
                    emit resumeFromSleepMode();
                    eventProcessed = true;
                    break;
                case PBT_APMSUSPEND:
                    qDebug() << ("PBT_APMSUSPEND received");
                    eventProcessed = true;
                    break;
            }
        }
    }

    import QtQuick 2.15
    import QtQuick.Window 2.15
    import QtQml 2.15
    
    Window {
        width: 640
        height: 480
        visible: true
        title: qsTr("Hello World")
    
        Rectangle {
            id: resumeSleepInfo
            width: 200
            height: 100
            anchors.centerIn: parent
            color: "red"
            Text {
                anchors.centerIn: parent
                text: "Resume from sleep"
            }
            visible: false
        }
    
        Connections {
            target: eventFilter
            function onResumeFromSleepMode() {
                console.log("onResumeFromSleepMode")
                resumeSleepInfo.visible = true;
            }
        }
    }

I can see all the messages in the log so the event is captured correctly and also passed to QML but nothing happens.
Any idea?