If you specify transform: Scale.Pressed a key right and left TextInput cursor disappears.

import QtQuick 2.0
import QtQuick.Controls 1.1

Item {
width: 900
height: 900

TextInput{
focus: true
width: 700
height: 50

color: "white"

anchors.top: parent.top
anchors.topMargin: 20
anchors.left: parent.left
anchors.leftMargin: 20

font.pixelSize:32

text: "0587239823794293646324723784"

Rectangle

{ anchors.fill: parent; z:-1; color: "black" }

transform: Scale

{ xScale: 0.66; yScale: 0.66;}

}
}