Regression: ComboBox: the textbox doesn't support multiline text because it ignores formatting

import QtQuick 2.8
import QtQuick.Controls 2.1
import QtQuick.Window 2.2


ApplicationWindow  {
    visible: true
    width: 400
    height: 300
    title: qsTr("ComboBox test with Qt 5.8")
    //title: qsTr("ComboBox test with Qt 5.9")

    ComboBox {
        id: multilineComboBox
        anchors {
            topMargin: 20
            rightMargin: 20
            leftMargin: 20
            top: parent.top
            right: parent.right
            left: parent.left
        }


        model: [
            "multiline:\n choise 1",
            "multiline:\n choise 2",
            "multiline:\n choise 3"
        ]
    }
}