PathView skipping index 0 when producing new delegate

ThomasKK

I'm building a calendar control where the user can swipe up and down using a pathway. Starting form an index say (I'm using 2020) swiping up will decrease the current year and swiping down will increase the current year. In theory the user can swipe in either direction for eternity with no boundary because I'm calculation the current year from a function. Everything works but for some reason PathView skips the index zero for each rotation. Index zero is initially produced but it seems it is never revisited.

The error only occurs for index 0 as far as I can see. Below is my code:
Any help is appreciated :)

import QtQuick 2.12
import QtQuick.Controls 2.12

PathView {
    id: view
    anchors.fill: parent
    model: 10
    property int dHeight: 350
    property int lastIndex: 0
    property int rotation: 0
    property int startyear: 2020

    delegate: yearDelegate

    path: Path {
        startX: parent.width/2
        startY: -dHeight/2
        PathLine {
            x: parent.width/2
            y: pathItemCount *dHeight-dHeight/2
        }
    }

    focus: true
    pathItemCount: 3

    highlightRangeMode: PathView.NoHighlightRange

    Component {
        id: yearDelegate
        Rectangle {
            id: delegateItem
            width: parent.width
            height: dHeight
            color: "yellow"
            border.color: "black"
            visible: PathView.onPath
            opacity: 0.5
            Text {
                id: textName
                anchors.fill: parent
                horizontalAlignment: Text.AlignHCenter
                verticalAlignment: Text.AlignVCenter
                Component.onCompleted: {
                     text = index + ": " + setDelegateIndex(index)
                }
            }
        }
    }

    function setDelegateIndex(index){
        if( (index - lastIndex) > 3 && lastIndex < 5 ){
            rotation = rotation-1;
        }
        if( (lastIndex-index) > 3 && lastIndex > 5 ){
                rotation = rotation+1;
        }
        var offset = (rotation*10)+index;
        console.log("index: " + index + ", lastIndex: " + lastIndex + ", rotation: " + rotation + ", offset: " + offset)
        lastIndex = index;
        return startyear+offset;
    }
}

ThomasKK

Commenting out highlightRangeMode seem to have helped. Could this be a bug?

//        highlightRangeMode: PathView.NoHighlightRange

mks__

Note that the default value for PathView is PathView.StrictlyEnforceRange. If it works ok with strictly enforced range and doesn't without it means that the view does something counterintuitive here. I don't have experience with PathView, but I have had a few struggles with ListView's highlightRangeMode setting. I don't think it's a bug, once I understood what it does I simply updated my mental model of it and were able to get it to work the way I wanted. That's the 'fun' part of QML - there's more to learn than meets the eye.