Qml 映射全局坐标不正确

在此代码部分中，我创建了内部包含窗口和矩形的简单示例。我为矩形设置 x = 100 和 y = 100 内部坐标。当我将这些坐标映射到全局并得到不正确的结果时，坐标总是比实际坐标多 2 倍。例如，如果我将 x 和 y 设置为 50，则结果将为 50*2 = 100。为什么会出现错误？我该如何修复它？

    import QtQuick 2.15
    import QtQuick.Window 2.15
    
    Window {
        id: root
    
        width: 640; height: 480; visible: true;
        title: qsTr("Hello World")
        onXChanged: innerRect.globalChanged();
        onYChanged: innerRect.globalChanged()
        onWidthChanged: innerRect.globalChanged();
        onHeightChanged: innerRect.globalChanged()
    
        Rectangle {
            id: innerRect
    
            signal globalChanged()
            property point globalPoint
            onGlobalChanged: {
                innerRect.globalPoint = mapToGlobal(innerRect.x, innerRect.y)
            }
            color: "yellow"
            width: parent.width / 2; height: parent.height / 2
    
            x: 100; y: 100
    
            Text {
                id: xCoord
    
                anchors.left: parent.left;
                anchors.leftMargin: 20
                anchors.verticalCenter: parent.verticalCenter
                text: "Gx: " + innerRect.globalPoint.x + " Wx: " + root.x
            }
            Text {
                id: yCoord
    
                anchors.right: parent.right;
                anchors.rightMargin: 20
                anchors.verticalCenter: parent.verticalCenter
                text: "Gy: " + innerRect.globalPoint.y + " Wy: " + root.y
            }
        }
    }