TabBar: cannot mix fixed and implicitly resized tabs

import QtQuick 2.7
import QtQuick.Window 2.2
import QtQuick.Controls 2.0

ApplicationWindow {
    id: window
    width: 360
    height: 360
    visible: true

    header: TabBar {
        id: bar
        Repeater {
            id: repeater
            model: 3
            TabButton {
                text: "Tab " + (index + 1)
            }
        }
        TabButton {
            text: "Fixed"
            width: contentItem.implicitWidth + leftPadding + rightPadding
        }
    }
}