TextArea's implicitHeight inconsistent

import QtQuick 2.2
import QtQuick.Controls 1.1

Rectangle {
    width: 640
    height: 500
    color: "gray"

    Row {
        anchors.fill: parent
        anchors.margins: 20
        spacing: 20

        Column {
            id: columnLeft
            spacing: 5
            width: 250

            TextArea {
                text: "One Liner"
                anchors.left: parent.left
                anchors.right: parent.right
                height: implicitHeight
            }

            TextArea {
                text: "Two Lines\nof Text"
                anchors.left: parent.left
                anchors.right: parent.right
                height: implicitHeight
            }

            TextArea {
                text: "Massive\n\nMulti-\nLine-\nText"
                anchors.left: parent.left
                anchors.right: parent.right
                height: implicitHeight
            }
        }

        Column {
            id: columnRight
            spacing: 5
            width: 250

            TextEdit {
                text: "One Liner"
                anchors.left: parent.left
                anchors.right: parent.right
                height: implicitHeight
                selectByMouse: true
            }

            TextEdit {
                text: "Two Lines\nof Text"
                anchors.left: parent.left
                anchors.right: parent.right
                height: implicitHeight
                selectByMouse: true
            }

            TextEdit {
                text: "Massive\n\nMulti-\nLine-\nText"
                anchors.left: parent.left
                anchors.right: parent.right
                height: implicitHeight
                selectByMouse: true
            }
        }
    }
}