Weird bug in qml

import QtQuick.Controls 1.0
import QtQuick 2.0
import Ubuntu.Components 1.1
import com.canonical.Oxide 1.0
import QtQuick.Controls.Styles 1.2
import QtQuick.Window 2.0



/*!
    \brief MainView with a Label and Button elements.
*/

MainView {
    // objectName for functional testing purposes (autopilot-qt5)
    objectName: "mainView"

    // Note! applicationName needs to match the "name" field of the click manifest
    applicationName: "com.ubuntu.developer.mkamenjak77.bugapp"

    /*
     This property enables the application to change orientation
     when the device is rotated. The default is false.
    */
    //automaticOrientation: true

    // Removes the old toolbar and enables new features of the new header.
    useDeprecatedToolbar: false

    width: Screen.width
    height: Screen.height
    Page {


        Column {
            spacing: units.gu(1)
            height:parent.height
            width:parent.width
            anchors {

                fill: parent
            }
/*
            Label {
                id: label
                objectName: "label"

                text: i18n.tr("Hello..")
            }*/
            Row{
                height:parent.height
            Column
            {

                TextArea {
                    id:textfield;
                   text: "http://google.com"
                            width: units.gu(4)
                            height: units.gu(75)
                            contentWidth: units.gu(1.5)
                            autoSize: true
                            maximumLineCount: 0
                            Keys.onReturnPressed: {
                           if (textfield.text.substring(0, 7) != "http://")
                           textfield.text = "http://" + textfield.text;
                           webview.url = textfield.text

                           }
                        }
                Button {

                    objectName: "button"
                    width: units.gu(4)/*
                    style: ButtonStyle {
                            background: Rectangle {
                                implicitWidth: 100
                                implicitHeight: 25
                                border.width: control.activeFocus ? 2 : 1
                                border.color: "#888"
                                radius: 4
                                gradient: Gradient {
                                    GradientStop { position: 0 ; color: control.pressed ? "#ccc" : "#eee" }
                                    GradientStop { position: 1 ; color: control.pressed ? "#aaa" : "#ccc" }
                                }
                            }
                        }*/

                    text: i18n.tr("Osvježi")

                    onClicked: {
                        webview.reload()
                    }
                }
                Button {
                    objectName: "button"
                    width: units.gu(4)/*
                    style: ButtonStyle {
                            background: Rectangle {
                                implicitWidth: 100
                                implicitHeight: 25
                                border.width: control.activeFocus ? 2 : 1
                                border.color: "#888"
                                radius: 4
                                gradient: Gradient {
                                    GradientStop { position: 0 ; color: control.pressed ? "#ccc" : "#eee" }
                                    GradientStop { position: 1 ; color: control.pressed ? "#aaa" : "#ccc" }
                                }
                            }
                        }*/

                    text: i18n.tr("Naprijed")

                    onClicked: {
                        webview.goForward()
                    }
                }
                Button {
                    objectName: "button"
                    width: units.gu(4)/*
                    style: ButtonStyle {
                            background: Rectangle {
                                implicitWidth: 100
                                implicitHeight: 25
                                border.width: control.activeFocus ? 2 : 1
                                border.color: "#888"
                                radius: 4
                                gradient: Gradient {
                                    GradientStop { position: 0 ; color: control.pressed ? "#ccc" : "#eee" }
                                    GradientStop { position: 1 ; color: control.pressed ? "#aaa" : "#ccc" }
                                }
                            }
                        }*/

                    text: i18n.tr("Natrag")

                    onClicked: {
                        webview.goBack()
                    }
                }
            }

            WebView {
                id: webview
                width: parent.width
                height: parent.height
                //onLoadFinished: area.contentY = -1 // workaround to force webview repaint

                Component.onCompleted: {
                    url = textfield.text
                }
            }

            }



        }
    }
}