QML Listview contentWidth always -1

Item {
  id: rootitem
  width: list.contentWidth
  height: list.contentHeight

  ListView {
    id: list
    anchors.fill: parent
    model: 4

    delegate: Text { // Could be any Item. Even with hardcoded width/height it doesn't work.
      text: index
    }

    Component.onCompleted: console.log("ch: " + contentHeight + " cw: " + contentWidth)
  }
}

I'm trying to set up an item that wraps around my contents. Using the listview contentHeight works great, but contentWidth never gets set... I've burned countless hours trying to mess with implicitWidth to no avail. All examples I've seen online always use a hard-coded root width. Maybe there's an implementation strategy I'm missing here, but I cannot for the life of me get my root item to automatically wrap around the size of my contents, and the contentWidth never being set affects this (looks like it comes down to childrenRect never having a width).

The closest related issue I can find to this is QTBUG-35063.

I forgot to add my hack of a workaround, which I'd prefer not to use...

delegate: Text {
  text: index

  Component.onCompleted: rootitem.width = (rootitem.width < width ? width : rootitem.width)
}