text in TextArea disappear when scrolling up large text by using scrollbar button "up"

ScrollView
    {
        id: view        
        property alias text: editor.text
        height: root.height * 0.89 - 3.33
        width: root.width

        ScrollBar.vertical: ScrollBar
        {
                 parent: view
                 x: view.width - width
                 y: view.topPadding
                 height: view.availableHeight
                 policy: ScrollBar.AlwaysOn
                 stepSize: 0.02
        }

        ScrollBar.horizontal.policy: ScrollBar.AlwaysOn
        anchors.top: editorBtn.bottom
        anchors.left: editorBtn.left
        anchors.topMargin: 5

        TextArea
        {
            id: editor
            objectName: "textEditor"
            font.pixelSize: 24
            background: Rectangle{
                color: "#D9D9D9"
            }
        }
    }