Popup doesn't respect height

import QtQuick 2.3
import QtQuick.Window 2.2
import Qt.labs.controls 1.0

Window {
    id: window
    width: 400
    height: 400
    visible: true

    Button {
        text: "Open"
        onClicked: popup.open()
    }

    Popup {
        id: popup
        width: 200
        height: 300
        modal: true
        focus: true
        closePolicy: Popup.OnEscape | Popup.OnPressOutside

        onHeightChanged: print("height", height)
    }
}