Bad antialized text shadow

[tatraian]

Hello,

I tried to create a white text with shadow on yellow background. On my linux I get ugly text.

Here is the example qml

import QtQuick 2.11
import QtQuick.Window 2.11
import QtGraphicalEffects 1.0

Window {
    visible: true
    width: 640
    height: 480
    Rectangle {
        id: background
        anchors.fill: parent
        color: "#f7dc16"

        Text {
            id: text
            anchors.verticalCenter: background.verticalCenter
            anchors.horizontalCenter: background.horizontalCenter
            color: "white"
            font.bold: true
            font.pixelSize: 22
            text: "Hello World"
            layer.enabled: true
            layer.effect: DropShadow {
                verticalOffset: 1
                horizontalOffset: 1
                radius: 0
            }
        }
    }

    title: qsTr("Hello World")
}

In this case I get "green" lines at the left side of the rendered characters:

Could you tell me, what I make wrong? Thanks:
Antal Tatrai