Text issues with eliding and padding

import QtQuick 2.9
import QtQuick.Window 2.0

Window {
    id: window
    visible: true
    width: 640
    height: 600

    property string text: "AAAAAAAAAAAaaaaaaaaaa"

    Column {
        Text {
            // Unelided, no explicit size; works
            text: window.text

            leftPadding: 38

            Rectangle {
                anchors.fill: parent
                color: "transparent"
                border.color: "darkorange"
            }
        }

        Text {
            // Right-elided, explicit size greater than leftPadding; works
            text: window.text
            width: 31
            elide: Text.ElideRight

            leftPadding: 30

            Rectangle {
                width: parent.leftPadding
                height: parent.height
                color: "grey"
                opacity: 0.5
            }

            Rectangle {
                anchors.fill: parent
                color: "transparent"
                border.color: "darkorange"
            }
        }

        Text {
            // Right-elided, explicit size less than leftPadding; doesn't show up
            text: window.text
            width: 30
            elide: Text.ElideRight

            leftPadding: 40

            Rectangle {
                width: parent.leftPadding
                height: parent.height
                color: "grey"
                opacity: 0.5
            }

            Rectangle {
                anchors.fill: parent
                color: "transparent"
                border.color: "darkorange"
            }
        }
    }
}

onImplicitWidthChanged: print(implicitWidth)