why FastBlur doesnt work?

[shokarta]

hello,
i have this simple code which doesnt work with no idea why...

import QtQuick 2.12
import QtQuick.Controls 2.0
import QtQuick.Controls.Styles 1.4
import QtGraphicalEffects 1.12

Item {
    id: parentObject

    property bool screenBlured: false
	onSsreenBluredChanged: { console.log(screenBlured); }	// works fine, upon clicking on image, this changes to true

    FastBlur {
		id: blur
        anchors.fill: parentObject // or should be testRect?
        source: parentObject // or should be  testRect?
        radius: screenBlured===true ? 32 : 0
		onRadiusChanged: { console.log(blur.radius); }	// when screenBlured changes to true, this debug says "0" at the same time, even when it should say "32"

        Behavior on radius {
            NumberAnimation { duration: 500 }
        }
    }

    Rectangle {
        id: testRect
        anchors.fill: parent

        Image {
            id: scanImage
            anchors.centerIn: parent
            source: "images/scan.ico"

            MouseArea {
                anchors.fill: parent
                onClicked: { blured.screenBlured = true; }
            }
        }
    }
}

[sierdzio]

Documentation clearly states:

Note: It is not supported to let the effect include itself, for instance by setting source to the effect's parent.

So you can't set the blur to fill parent object.