Editable SpinBox's valueModified() signal not emitted when text changed

import QtQuick 2.7
import QtQuick.Controls 2.0

ApplicationWindow {
    visible: true
    width: 585
    height: 113
    title: qsTr("test")

    SpinBox {
        from: 1
        to: 5120
        editable: true
        stepSize: 1

        onValueModified: print("modified")
    }
}