Wrong z order and focus when creating multiple QML windows

When creating multiple windows with the QtQuick Window API, transient children are created before the parents and thus the windows have a wrong focus and z-order.

In following example "win1" will have a higher z-order than "win2" and the keyboard focus. The expected behaviour would be that "win2" would be on top and has the focus.

Window {
  id: win1
  visible: true

  Window {
    id: win2
    visible: true
  }
}