ListView ignores `displayMarginBeginning: 0`?

[patrickkidd]

I initialize ListView.contentY to initially hide the header using contentY: 0 so that you only see it if you swipe down, like in iOS Mail. But ListView seams to ignore displayMarginBeginning: 0 and scrolls to reveal the header when currentIndex is set to 0 even when the first item delegate is completely in view.

Is there a way to prevent this?

import QtQuick 2.5
import QtQuick.Layouts 1.12

ListView {
    id: root
    header: Rectangle {  color: 'red'; height: 40; width: parent.width }
    displayMarginBeginning: 0
    delegate: Item {
        width: parent.width
        height: 50
        RowLayout {
            anchors.fill: parent
            Text { text: name }
            Text { text: cost }
        }
        Rectangle {
            color: index == root.currentIndex ? '#aa0000ff' : 'transparent'
            anchors.fill: parent
        }
    }

    // will scroll to ensure item is visible, but                                                                                                                                                               
    // ignores displayMarginBeginning for first item                                                                                                                                                            
    Timer {
	running: true;
        interval: 1000;
	repeat: true
        onTriggered: {
            if(currentIndex == 0)
	        currentIndex = 5;
            else
                currentIndex = 0;
        }
    }

    model: ListModel {
        ListElement { name: "Apple"; cost: 2.45 }
        ListElement { name: "Orange"; cost: 3.25 }
        ListElement { name: "Banana"; cost: 1.95 }
        ListElement { name: "Apple"; cost: 2.45 }
        ListElement { name: "Orange"; cost: 3.25 }
        ListElement { name: "Banana"; cost: 1.95 }
    }
}